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  • Why Industries Rely On Sherwood Valves: A Trusted Valve Manufacturing Company

    The complex functioning of valves is critical, especially in manufacturing industries that rely greatly upon them. Sherwood Valve LLC is a global leader in providing fluid control and system critical gas solutions for industrial gas, chlorine gas, alternative fuels, HVACR, specialty gas, and life support markets. The company understands that valves are a vital piece of your business and thus infuses diligent manufacturing processes and quality checks in their construction. Sherwood is expert in quality and compliance testing as well as product design.

    Sherwood Valves

    We, at Evergreen Midwest are authorized dealers and exclusive distributors of Sherwood brand valves and accessories for compressed gas cylinders. We trust Sherwood Valves due to these following values:


    Whether you are into production, supply, or use of welding or medical gas mixtures or any other commonly used gases (including nitrogen, carbon dioxide, helium, hydrogen, and chlorine) performance and safety are your top priorities. That is why you should rely on Sherwood Valves.


    Having over 90 years of industry experience, the company manufactures valves with automated processes and the industry’s latest technologies so that customers are not overburdened with costs; neither do they compromise on product quality. They observe enhanced inspection and process controls that also includes infrared thermal imaging in all the individual stages of the manufacturing processes to maintain the highest safety, reliability, and product quality.


    The company is fully certified by FDA and complies with the stringent quality standards of ISO 9001. The valves also meet the industry standards of the Compressed Gas Association, the Chlorine Institute, Underwriters laboratories, U.S. Government military specifications, and OSHA.


    Sherwood is a totally integrated valve manufacturing company that manufactures all valve components including raw forgings and rods. They have their own development team and fully-functioning facility that ensures reliability and durability of the valves.

    Moreover, the company believes in continually improving their products and processes to satisfy end users with their high quality and cost-efficient valves. It proudly represents more than what may be called just a “Quality Policy”. Therefore, most of the industries make a mark by using only Sherwood Valves in their production, to provide customers piece of mind and keep pace with their requirements.

  • How Has Valve Repair Technology Changed In the Past Few Years?

    There was a time when chemical plants and refineries had their own valve shops that were well-equipped with the necessary machinery and valve repair technicians. Though most of the times the servicemen replaced the valves rather than refurbishing them. Soon, there was a boom in the industrial valve repair segment and dozens of small as well as medium sized companies emerged to fill the vacuum.


    In those times, it was quite easier to repair the valves as the design of valves including relief, globe and gate valves had a basic design that could be easily repaired whenever needed. After a few years, i.e. at the end of 20th century, due to over engineering many of the tanks sustained decades of service and many repair cycles. There has been a situation where an experienced technician would prefer repairing a gate valve that is 40 years old rather than the newer designs. Imports became cheaper and this led to decrease in demand for the domestic products which in turn resulted in authorization of independent valve repair shops by major valve manufacturers. These authorized facilities could get to know information that was previously considered as proprietary and the result was a better service to the end users. However, with this increase in independent service centers, bogus and fraudulent companies started to emerge who misrepresented products. Through the 80’s, the bogus valve epidemic spread far when the manufacturers regained their monopoly.

    It was in 1990 that the Valve Manufacturers of America (VMA) extended its help by establishing the Valve Repair Council (VRC) that ensured protection of its customers and members from the hazards of improperly repaired valves. The VRC helped manufacturers as well as end users to choose quality valve repair facilities. Then there was an effort by the valve repair shops and end users that aimed at standardizing repair specifications for valves and therefore reducing the repair cost. They formed an API group which created a document – the API Recommended Practice 621 “Reconditioning of Metallic Gate, Globe and Check Valves” and it resulted in disagreement between the end users and valve manufacturers due to the increased liability it created at the manufacturer’s end. However, it announced a baseline and a standardized procedure for the repair of industrial valves.

    gate valves series

    Today, the valve repair function is capable of providing much more than just repaired valves. It now accompanies valuable information of the product along with users’ feedback. The more sophisticated valve repair programs are designed to record a series of measurements and visual inspections while maintaining the detailed progress of the valve performance through its service. It provides data for comparison at each repair stage and thus offers a cost-effective approach to the end users about how a particular valve brand sizes and performs. The rule of thumb states that a valve repair must not exceed 50% of the new valve replacement price. As a result, it is observed that most of the inexpensive valves are better to be scrapped than repaired at a higher price.

    For more information about industrial valves, please visit or get in touch with us at 1800.659.3358.

  • All You Should Know About Check Valves

    Check valves are a kind of valves that serve multiple purposes and are an essential valve required in almost all the industries. Practically, there is no industry where these are not installed on the operating systems. Valves in general are a critical component of any machinery and therefore must be selected after proper research for quality, durability, and sustainability. Your decision will greatly impact the functioning of machineries and the ultimate outcome of the project the valves are used for.

    Construction of a Check Valve

    Check Valves

    The basic construction consists of a bonnet, valve body, and a disk that is attached to a hinge and moves away from the valve seat to allow the fluid to flow forward and returns when the upstream flow is stopped and thereby preventing reverse flow. The folding disc valves have a disk that consists of two halves that are attached in the middle and fold backwards once the upstream flow is initiated. When the upstream flow stops, these two halves spontaneously close the flow path. In lift-check valves, the disk comes in the form of a piston which is moved out of the path during upstream flow and returns by gravity to stop the flow. In case of ball valves, the disc is in the form of a ball.

    : : :

    Applications of Check Valves/ One-Directional Valves

    These valves are generally installed in operations in which there are chances of total or partial shut-down of a compressor or pumps due to backflow of gases or liquids. So, these types of valves are most commonly found in gas systems and certain other applications where liquid flow has to be controlled.

    This list is a necessary go-through before placing an order as it gives a complete insight of the utilities these valves can be put to:

        • Be careful while selecting the size as properly sized valves contributes to longer life of the valves, pumps, as well as other related components.
        • While an oversized valve could cause an early wear or failure of certain essential components, an undersized valve results in high loss in pressure, excessive noise, and even vibration.
        • They are essential for smooth operation of fluid pumping systems.
        • They can efficiently reduce Water Hammer condition that can badly damage pipes, Water hammer is caused due to pressure surge because of liquid forcing to stop suddenly while in motion.
        • A properly sized check valve guarantees to provide the prescribed flow while consuming minimal amount of energy which makes it truly cost and energy-efficient.
        • It is utmost important to keep a check on the valves for their size before being used for low flow applications. This will ensure that the valves are completely open on maximum fluid flow.
        • There are soft seats that offer bubble tight leakage control and the metal sealing surfaces permit some amount of leakage to seep through.

    At Evergreen Midwest, you will find a wide range of check valves. Please visit to select a specific type that suits your requirements.

  • Understanding Irrigation Master Valves and Their Wirings

    Master valves are essential equipment when considering the installation of an irrigation system. It is an electric valve that completely controls the water flow from the supply point. The valve helps reduce water leakage from a leaky station valve as it supplies pressure to it. As the name suggests, it masters the water supply in case your irrigation main line damages. A master electric valve is similar to your station valves, but instead of being installed in the downstream from the main line, it is installed at the front of the line in the upstream and is connected to the master pump in the controller.

    Let us now understand the master/pump valves wiring:

    Usually the timers in the sprinkler systems supply power to a relay so that it could send power to the sprinkler pump. The sprinkler systems use secondary water and are supplied water at very low temperatures.

    Master Valves

      • The circuit is connected with the wires from the relay – one wire to the common terminal and one to the valve terminal. The relay gets power when the timer activates it.
      • On receiving power, the relay closes contacts and power goes to the pump to activate it. The selector on the pump allows using 110 volts, otherwise it is pre-wired for 230 volts.
      • At the same time when the controller/timer sends power to the sprinkler pump, it also sends power to the sprinkler master valve and opens it. So, when the pump creates pressure in the system, this opens the sprinkler zone and waits for water.
      • This is the complete cycle. On completion of this cycle, power to the sprinkler valves is shut off by the timer/controller. At the same time, it shuts off the power that is supplied to the relay and the pump. Although it varies from timer to timer, most of the pump valve circuits are by default on the sprinkler controller/ timer.

      Its configuration is technically simple. However, users no longer have to select the zone to which the valve is connected to, as now the option will completely depend on the controller selected when you set up the controller for the first time. Evergreen Midwest is an online store that stocks all types of industrial valves and regulators and has been serving the industry since 1973. To place an order for master valves, please call us at 1800.659.3358 or visit our website at

  • What Risks are Chlorine Valves Exposed to?

    Chlorine valves are exposed to various risks referring to the chemical properties of the liquid:

    chlorine valvesHydroscopic: In case the water content in dry chlorine is more than 50 parts per million, ferric chlorides (CL3F3) and hydrochloric acid (HCL) are formed. The HCL is highly corrosive and has the potential to damage the piping system that are made from carbon steel while the CL3F3 can create problems for seating surfaces of Teflon.

    Also, the liquid is classified as a TIH – Toxic by Inhalation and this property clearly indicates the critical nature of the substance and the job of the valves to keep the liquid inside without any leaks from bonnet joints, packing, and castings.

    Inflammability: Chlorine, by itself is neither flammable nor explosive. However, it may support combustion under specific conditions. Gas, as well as liquid chlorine, tend to react explosively with hydrocarbon-based lubricants. The valves must be prepared and properly cleaned for servicing the substance packed within. In addition, proper care must be taken while packaging and transporting these cylinders.

    Dual Phase Flow: These are known to cause cavitation and flashing which is problematic for valves because of the energy that is generated inside the valve could potentially damage stems and trim.

    Oil and Grease: Chlorine sometimes can react explosively with organic materials including oil and grease that comes from pumps, valves, air compressors, pipe thread lubricants, or oil-diaphragm instrumentation.

    Hydrogen: Chlorine if mixed with hydrogen can become potentially explosive within a specific range of concentration levels. If the cylinder is placed along with hydrogen containing cylinders, valves play an important part in securing the liquid/gas within and preventing hazardous situations.

    Temperature: The volume of chlorine increases with increasing temperature. To avoid this volumetric expansion, there should be precautions that are taken to keep the temperature at a consistent and appropriate temperature.

    Auto-refrigeration: When chlorine is released, it tends to escape rapidly. However, the pressure in the cylinder attempts to equalize with that of the outer atmosphere.

    Valves are subjected to critical conditions which demand extra carefulness and safety standards. These chlorine valves must be bought from a reliable industrial valve dealer like Evergreen Midwest, who has been serving high quality and durable valves and regulators to the industry since 1978. Evergreen Midwest has a wide range of valves that are essentially required for critical operations. Please visit: or call 800.659.3358 to know more details. We look forward to hearing from you soon!

  • Understanding Cryogenics and the Associated Hazards

    Cryogenic liquids are formed when gasses are converted into liquid form. They are liquefied gases that have a boiling point of -150°C (-238°F). As there is a substantial difference between the gas and surrounding environment, it requires a special equipment to contain these liquids. Typically, the arrangement consists of a pressure control system, a storage tank, piping required for fill, supply, one or more vaporizers, and vaporization.

    Characteristics of Cryogenic Containers


    The tank looks like a vacuum bottle that is manufactured to keep heat away from the liquid. The cryogenic liquid cylinders are vacuum jacketed pressure vessels that are insulated too for obvious reasons. Vaporization of the liquids is a continuous process due to heat leak of the containers. However, the rates of vaporization depend upon the volume of the stored product or design of the container. The containers holding these liquids are manufactured in accordance to the latest industry standards and comply with all the industrial cylinder regulations. They are fitted with insulated rigid or flexible lines that are used to remove the liquid from the containers and hence minimize the loss of the liquid product to gas. The cylinders are designed to dispense gases like Argon with standard CGA (Compressed Gas Association) outlets along with suitable cryogenic regulators. The cylinders have capacities between 80 and 450 liters of liquid and operate at pressures up to 350 psig.

    Handling & Storage of Cryogenic Containers

    The cylinders must be stored in a confined space where adequate ventilation is available. They should also be equipped with cryogenic regulators that control internal pressure build-up. Users must take care not to tamper with, remove, or plug any pressure relief device without proper monitoring. No unprotected body part must be exposed to un-insulated pipes or equipment containing these critical-natured products as the extremely cold metal causes the flesh to stick fast and tear when attempting to withdraw from it. Instead, experts suggest using a hand truck for moving these containers. The containers should always be held and stored in an upright position and must not be dropped or rolled on their sides. DO NOT USE ADAPTERS – as mentioned in the container’s caution instructions. Always use proper connection. Industry professionals suggest using a check valve or some protective apparatus on gas withdrawal systems to prevent reverse flow of the liquid. The piping must always be equipped with pressure relief devices to prevent the cryogenic liquids or cold gases from getting trapped in piping between valves.

    Evergreen Midwest has been serving the industry with its industry-compliant valves and regulators since 1978 and adheres to the highest quality standards while delivering products to customers. For any of your industrial equipment requirements, especially gas regulators and valves, please feel free to contact us by phone at 1800.659.3358 or visit our website at to get an insight of all the products we provide.

  • How to Inflate a Large Number of Balloons Using a Helium Tank


    Parties without balloons are just unimaginable. But it is not a mere fifty or hundred numbers, but a much larger number to decorate lavishly. In this era of technological advancements, blowing out your lungs and being tired before the party starts, is not a clever option. Balloon inflators have come to the rescue of event planners and made partying much easier. Let us see how to fill them with the help of a helium tank.

    How much helium will you need?

    To measure the amount you would require to fill the size of balloons you have, you need to calculate it by multiplying the number you need to fill by the volume required. For example, for a standard-sized unit, that is approximately 11” in size would require around .50cu.ft. of helium. In order to fill nearly 100 11” units, you would multiply 100 by .50 (volume of cu. ft. required per balloon) to find you would need a 50 cu.ft. helium tank.


    Which type is used?

    Once you determine the amount of helium required and purchase the tank, it is time to blow up the balloons. You also need to check whether you have latex or mylar types as the time for which they would stay up depends upon the material and the temperature, humidity, and altitude of your location. Those made from latex can stay afloat for a short period i.e. 4-16 hours while the mylar ones remain suspended in the air for as much as 2 to 14 days.

    How to use the Helium Tank?

    Check your helium tank for a release knob that resembles a garden hose faucet handle and turn it counter-clockwise. Now, use one of your hands to attach the mouth to the tank’s nozzle while your other hand can work on the nozzle to release helium. The balloon should inflate quickly. However, if nothing happens, try to activate it in the tank by pressing the nozzle upward.

    How much should you inflate?

    You should take care not to overfill. Usually, latex ones take a round shape when inflated fully. The pear-shaped ones are probably over-inflated and are likely to burst. To take it off the filler, pinch the end that is attached to the it and slowly pull it off the valve. Secure the helium in the inflated round with a tight knot.

    You will find a complete line of balloon fillers at Evergreen Midwest that will surely ease your worry of blowing up hundreds and thousands of numbers for your party decorations. We offer them at competitive prices. Please visit our website for a quick view of all of our products, or contact us by phone at 1800.659.3358 so that we can suggest the most suitable balloon filler to fit your needs.


  • Basic Types of Industrial Gas Valves Everyone Should Know About

    Valves are essential components of almost any industrial machinery as they control the pressure and flow of the contents within a cylinder or any other materials such as tanks. Industrial gas valves are critical parts and must be maintained in proper condition, otherwise it could result in ultimate fall or deterioration of the complete system. In major industrial set-ups, certain mishaps are most likely to take place. To avoid these kind of catastrophic system failures, it is important that everyone (especially industrial workers) have a basic knowledge of major types of industrial valves.

    Industrial Gas Valves

    What are Valves?

    Valves are mechanical equipment that are used to control or regulate the flow of an industrial substance from its container (i.e. they can start, stop, increase or decrease the pressure of the flow). They are designed to be able to handle all varieties of materials like gases, liquids, or corrosive materials. Their versatility in function allows them to serve a wide variety of industries, including the petrochemical industry, manufacturing industry, and the compressed gas industry.

    Major Types of Valves

    Globe Valves: These valves have a disk that can start, stop, or throttle the flow of a pipeline. The disk works by moving from the seat to prevent water hammer and vibrations. The globe valves are linear motion valves that are mostly used as an on/off device or a regulating device in companies.

    Pressure Relief Valves: As the name implies, the pressure relief valves are industrial gas valves that prevent over-pressure situations that could possibly occur in high-pressure systems. The valve opens when there is an increase in the pressure so that more fluid can flow through. It ensures that an appropriate pressure is maintained while stabilizing operations.

    Ball Valves: Ball valves are fast-acting valves that use a rotating ball to transfer the material through a system. The rotating ball is responsible for opening and closing of the valve.

    Check Valves: It is a type of valves that maintains the flow of substances in one direction. It is a two-port device and uses a clapper that lifts to maintain a linear flow of fluids. In case the pressure tends to decrease or when the flow starts reversing its direction, the flapper closes the valve.

    Gate Valves:  Gate valves are bidirectional industrial gas valves that offer minimum flow restriction and are designed to start or stop a straight line flow. These valves are usually kept either fully closed or fully open. These valves are quite sensitive to vibrations when open and cannot be quickly opened or closed.

    Visit for more insight on industrial gas valves and regulators. Evergreen Midwest has been serving the industry with high-quality industrial equipment since 1978. You can contact us at 800.659.3358 and we will be happy to serve you.

  • Important Tips for Safe Storage of CO2 Cylinders

    Storing compressed gas cylinders is a conscious and responsible job. As different gases have different properties and pose risks if mishandled, they need to be identified and stored with specific precautions. Specifically considering Carbon Dioxide cylinders, users must be aware of the possible hazards associated with CO2 and must be practically trained in safe practices of CO2 cylinder storage.

    Here’s a list of precautions to be taken while storing CO2 cylinders.

    • While storing empty CO2 cylinders, take care to close the valve tightly. The valve must be opened only when the gas is being used and closed when the gas is not in use.
    • It is generally recommended that CO2 cylinders must be stored standing on their base. However, many industries also store them lying on their side.
    • Avoid storing a charged CO2 cylinder in the cab portion of any vehicle or in a passenger vehicle.
    • Never store them in a place where they accidentally or knowingly become a part of the electrical circuit.
    • The pressure of your cylinder should be 880 psi (for brewing industry). The CO2 is cold enough to turn into a liquid at 880 psi
    • The storage area where CO2 cylinders are stored should:
    • Be free from a corrosive atmosphere and dry.
    • Be generously ventilated, because as little as 15% of the gas’ concentration would be responsible for unconsciousness within a minute.
    • Be away from direct heat (continuous or intermittent). A well-charged CO2 cylinder operates its safety relief devices when the pressure exceeds 2800-3000 psi and could escape through the safety relief device at a temperature of approximately 150°F (65.6°C). If the cylinder is slightly over-filled, it may escape even at a lower temperature. So, the ideal temperature to store these cylinders is below 125°F (51.7°C).
    • Be away from or protected from the edge of elevated areas, if the cylinder rolls it can cause hazardous damage to the cylinder, valve, property, or human beings in the nearing areas.
    • Be away from heavy traffic areas as in crowded places, the chances of accidents increase.


    Carbon Dioxide cylindersAll compressed gas cylinders including the Carbon Dioxide cylinders should be ideally secured using a chain or strap. Nesting of compressed gas cylinders is an equivalent safe storage mechanism that is used by the suppliers as well as distributor warehouses as it confirms that every cylinder has three points of contact – either the wall or other gas cylinders.

    At Evergreen Midwest, we offer CO2 cylinders th at can be relied upon for quality and industry specifications. With years of service to customers, we have been a trusted source of all industrial cylinders and our prompt product delivery is always appreciated by our clients. To place your order, please visit our website  or call us at 800.659.3358.

  • How to Get Rid of that Extra Foamy Beer?

    Beer tastes great with that creamy head on the top, however sometimes you find that your glass is filled with extra foam that spurs up unnecessarily. If you face consistent foam problems, it is sure that there is some problem with your kegerator or maybe you are playing the pressure wrong.

    Let’s understand the physics behind foamy beer:

    foamy beerBeer is a carbonated liquid, which means that more gas resides in the mixture at colder temperatures. The best temperature setting to preserve the original flavor of the beer is around 34-38 degrees but when the temperature starts rising above 40 degrees, CO2 tends to evacuate the beer and that results in the foam (most of the times).

    Once you know the temperature appropriations to be taken care of, the next thing to be worked on is the beer tap regulator settings. Under normal circumstances, beer can be pushed from 4PSI to 14 PSI and most kegerators deliver beer best between 5 PSI and 12 PSI. Exact pressure can be found out by analyzing your beer lines. You can push the beer at more pressure if the beer is colder or the inner diameter of the beer line is bigger. On the contrary, high temperature or high pressure can result in excess foam. If your beer lines are smaller i.e. about ¼" inner diameter, it can lead to a foamy texture.


    Now that you know the foam basics, you are good to pour in just the right beer in your glass. However, there are certain things to be observed:

    Beer Tap and Beverage Regulators available at Evergreen Midwest
    • The keg of a beer requires some time to settle after transportation. During commute of a few blocks by car, the temperature also tends to be changed. After reaching the destination, it is better to let the keg settle in for at least 2-4 hours before pouring.
    • Ensure that you use the proper pouring tilt which would help to reduce the foam due to an improper pour.
    • You may also have to check your beer lines and fittings. Dirty beer lines may also result in a foamy beer so it is important to keep your beer lines clean. Also, ensure that all your fittings are tight enough to prevent the outside air from being sucked into the beer solution that causes excess foaminess.
    • In some cases the length of the beer lines may cause extra foam. Ideally, six to eight feet of beer line is optimal.
    • If all of the above is right in place, there may be some problem with the regulator (dropped or banged). So, you need to fix the beer tap regulator malfunction first by contacting your nearest valve and regulator supplier to repair or replace it immediately.


    The Evergreen Midwest store intends to serve beer tap regulators and all types of industrial valves that are used in gas cylinders and other industrial set ups as well as home settings. We are your reliable source for valves and regulators as we supply only branded products manufactured by finest manufacturers like Sherwood Valve, Superior Valve, Catalina Cylinder, Rego Cryoflow, Fluoramics, Flexible Components, Saint Gobain Performance Plastics, Marshall Excelsior, Taprite, Watson and Fastest.

    You can reach us at our toll free number: 800.659.3358 or visit our website for more options


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