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Evergreen Midwest Co

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Valves /
HVAC Valves /
Pressure Relief Valves

Pressure Relief Valves

Pressure Relief Valves

Our pressure relief valves are designed to protect industrial piping systems and vessels from over-pressurization. These valves open when there's an increase from the set pressure, and close when the level drops before the set pressure.

Three functional elements of a HVAC pressure relief valve:

Valve element – typically a spring-loaded poppet valve
Sensing element – a piston or a diaphragm
Reference force element – usually a spring

When selecting a pressure relief valve, special care should be taken. We at Evergreen recommend customers browse through our stock of atmospheric pressure relief valves, straight through pressure relief valves, & female connection pressure relief valves to select the type that best serves your specific purpose.

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SKU	DESCRIPTION	MANUFACTURER
3220C-700	Angled Pressure Relief Valves, 1/2 NPT x 5/8 SAE, 700 PSI, Discharge Capacity 46.4	Mueller
3220C-650	Angled Pressure Relief Valves, 1/2 NPT x 5/8 SAE, 650 PSI, Discharge Capacity 43.1	Mueller
3220C-600	Angled Pressure Relief Valves, 1/2 NPT x 5/8 SAE, 600 PSI, Discharge Capacity 39.9	Mueller
3220-500	Angled Pressure Relief Valves, 1/2 NPT x 5/8 SAE, 500 PSI, Discharge Capacity 33.3	Mueller
3220-450	Angled Pressure Relief Valves, 1/2 NPT x 5/8 SAE, 450 PSI, Discharge Capacity 30.1	Mueller
3220-425	Angled Pressure Relief Valves, 1/2 NPT x 5/8 SAE, 425 PSI, Discharge Capacity 28.4	Mueller
3220-400	Angled Pressure Relief Valves, 1/2 NPT x 5/8 SAE, 400 PSI, Discharge Capacity 26.8	Mueller
3220-350	Angled Pressure Relief Valves, 1/2 NPT x 5/8 SAE, 350 PSI, Discharge Capacity 23.6	Mueller
3220-235	Angled Pressure Relief Valves, 1/2 NPT x 5/8 SAE, 235 PSI, Discharge Capacity 16.1	Mueller
3216-425	Angled Pressure Relief Valves, 3/8 NPT x 1/2 SAE, 425 PSI, Discharge Capacity 28.4	Mueller
3215C-650	Angled Pressure Relief Valves, 3/8 NPT x 1/2 SAE, 650 PSI, Discharge Capacity 21.6	Mueller
3215-450	Angled Pressure Relief Valves, 3/8 NPT x 1/2 SAE, 450 PSI, Discharge Capacity 15.1	Mueller
3215-425	Angled Pressure Relief Valves, 3/8 NPT x 1/2 SAE, 425 PSI, Discharge Capacity 14.3	Mueller
3215-400	Angled Pressure Relief Valves, 3/8 NPT x 1/2 SAE, 400 PSI, Discharge Capacity 13.5	Mueller
3215-350	Angled Pressure Relief Valves, 3/8 NPT x 1/2 SAE, 350 PSI, Discharge Capacity 11.8	Mueller
3215-300	Angled Pressure Relief Valves, 3/8 NPT x 1/2 SAE, 300 PSI, Discharge Capacity 10.2	Mueller
3214C-600	Angled Pressure Relief Valves, 3/8 NPT x 3/8 SAE, 600 PSI, Discharge Capacity 19.9	Mueller
3214C-550	Angled Pressure Relief Valves, 3/8 NPT x 3/8 SAE, 550 PSI, Discharge Capacity 18.3	Mueller
3214-450	Angled Pressure Relief Valves, 3/8 NPT x 3/8 SAE, 450 PSI, Discharge Capacity 15.1	Mueller
3214-425	Angled Pressure Relief Valves, 3/8 NPT x 3/8 SAE, 425 PSI, Discharge Capacity 14.3	Mueller
3214-350	Angled Pressure Relief Valves, 3/8 NPT x 3/8 SAE, 350 PSI, Discharge Capacity 11.8	Mueller
3214-300	Angled Pressure Relief Valves, 3/8 NPT x 3/8 SAE, 300 PSI, Discharge Capacity 10.2	Mueller
3214-235	Angled Pressure Relief Valves, 3/8 NPT x 3/8 SAE, 235 PSI, Discharge Capacity 8.1	Mueller
3212C-650	Angled Pressure Relief Valves, 1/4 NPT x 3/8 SAE, 650 PSI, Discharge Capacity 21.6	Mueller
3212-450	Angled Pressure Relief Valves, 1/4 NPT x 3/8 SAE, 450 PSI, Discharge Capacity 15.1	Mueller

superior_hvacr_prv_122.pdf