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Vent Relief Valve High Pressure

1/8" - 1/4" NPT
150 - 600 Psig

Description

A compact, highly accurate, direct acting pressure relief valve. Factory preset to desired crack pressure and/or flow specifications. Internal adjustment provides tamper proof safety against inadvertent pressure changes. Available in vent to atmosphere or inline configurations. Valves feature an encapsulated O-ring seal to prevent extrusion at higher differential pressures.

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Features and Benefits

Accurate and Repeatable Cracking Pressure
100% Factory Preset and Tested
Zero Leakage to 95 - 98% of Set Pressure
Tamper Proof Adjustment
Excellent Reseal Performance
Compact Size

Technical Data

Set Pressure Range: 150 to 600 Psig (10.3 to 42 bar)
Inline Valves (Series VRVHI):
- Proof Pressure: 750 Psig (52 bar)
- Burst Pressure: >1000 Psig (69 bar)
Set Pressure Tolerance: Factory preset +/- 5% on increasing pressure
Reseal: 90% of Set Pressure
Temperature Range: -320°F to 350°F(-195°C to 177°C)
Based on seal selection, see ordering information

Materials of Constructions

Component	Material
Valve Body, Stem, O-Ring Cup	Brass, ASTM B16
Spring Retainer	316 SS, ASTM A479
Seal¹	As specified, see ordering information
Spring	302 SS/17-7 PH, ASTM A313
Locknut	18-8 SS
¹ Lubricated with Krytox^TM

Dimensional Data

Pipe Size NPT	VRVH		VRVHI
Pipe Size NPT	A	Hex	A	Hex
1/8"	0.94	1/2"	1.44	1/2"
1/4"	1.29	5/8"	1.75	3/4"
Dimensional data is stated in inches

Flow Data, Series VRVH (Vent to Atmosphere)

Nominal Spring		150		250		500
Set Pressure Range (Psig)		125 - 175		175 - 350		350 - 600
Valve Size	Orifice	Flow (SCFM)	Kd	Flow (SCFM)	Kd	Flow (SCFM)	Kd
1/8" NPT (VRVH - 125)	0.156	7.5	0.12	12.5	0.12	33	0.16
1/4" NPT (VRVH - 250)	0.293	50	0.22	90	0.24	150	0.21

Flow Data, Series VRVHI (Inline)

Nominal Spring		150		250		500
Set Pressure Range (Psig)		125 - 175		175 - 350		350 - 600
Valve Size	Orifice	Flow (SCFM)	Kd	Flow (SCFM)	Kd	Flow (SCFM)	Kd
1/8" NPT (VRVHI - 125)	0.156	12	0.18	13.5	0.13	35	0.17
1/4" NPT (VRVHI - 250)	0.250	45	0.27	80	0.30	175	0.33

Ordering Information

PROPER COMPONENT SELECTION - When specifying a component, the total system design must be considered to ensure safe and trouble-free performance. Intended component function, materials compatibility, pressure ratings, installation, environment and maintenance are the responsibility of the system designer.

For Instructions on How to Select Your Model, click here.

Vent Relief Valve High Pressure (Vent to Atmosphere)