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Relief Valves at Stra-Val
Stra-Val
21 Columbus Avenue
Garfield, NJ 07026
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(973) 340-9955 (973) 340-9933
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Model Rvi20-P 

Low-Pressure Relief Valve
In-Line ported, Diaphragm Valve
Accurate, Adjustable Relief Pres

 See Pricing Table Below

Low Pressure Relief Valve, RVi20-P<br />Stainless Steel Valve<br />Titanium Valve<br />Hastelloy Valve

Printable
Product Specs

PDF Instructions

Pricing
  • PVC, CPVC, PVDF, or PTFE body
  • 1/2"-2" NPT THD 
  • Accurate relief pressures from 0.50 PSI (0.03 Bar) to 75 PSI (~5 Bar)
  • Adjustable pressure in multiple spring ranges 
  •  

Features

  • Low-pressure valve body: Available in a wide variety of high-performance engineered plastics PVC, CPVC, PTFE, or PVDF.
  • Elastomeric diaphragm: Elastomers includes Teflon (PTFE) with reinforced  Viton, Buna.
  • Spring chamber: Safety relief valve standard construction is PVC.. Alternates: CPVC, PVDF
  • In-line valve porting is standard. This is not a through flow model. Only ports are inline. For right-angle valve porting (side inlet, bottom outlet) see model RVL-20-P.

Applications

This safety relief valve can be used for relieving pressures and maintaining upstream line pressures to a specific set point. Pressure relief valve can also be used for bypassing fluids. This is a diaphragm low-pressure valve which is used where accurate set pressures must be maintained. The large diaphragm area compared to a piston pressure relief valve produces much more accurate pressure control with very low hysteresis between opening and closing pressures. See available orifice sizes and flow Cv below.



Options

See pricing Table to select available options

Principle of Operation

This is a diaphragm and spring type relief valve where the spring constantly opposes the pressure acting against the diaphragm which seals off the inlet port from the outlet port at the valve seat. The desired relief or bypass pressure is achieved by compressing the spring until the spring force is adequate to balance the pressure force acting against the diaphragm. When the inlet pressure exceeds the set pressure, the diaphragm will open to relieve and bypass the excess pressure.The valve will operate in a vertical orientation as illustrated, horizontal, or any other orientation.

Although the ports are inline, this is not a "through flow" model where flow continuously passes through the valve. If this valve were to be installed in a flow line, it would shut off flow to the line completely and open only when the set pressure is exceeded.  This valve is  typically mounted to a device to be protected such as a tank or other pressure containing device. If a flow stream needs to be protected from overpressure, then the valve is mounted on the side of a Tee, or at the end of a line branch where it will pass excess flow only when the valve opens. The outlet port of the valve is usually piped to a drain or discharged directly to atmosphere only if the liquid or gas is safe to be discharged without injuring personnel or damaging equipment nearby .


In-Line Plastic Relief Valve
RVi-20P
Material List and Specification

1. Adjusting screw  Stainless Steel
2. Lock nut Stainless Steel
3. Spring chamber PVC
4. Spring pusher Stainless Steel
5. Spring Stainless Steel
6. Spring Carrier Stainless Steel
7. Diaphragm Teflon / Viton
8. *Body PVC, CPVC, PTFE

*Body also available in brass, PVC, Teflon, Monel, and Hastelloy

Dimensions
Dimensions (inch)
A    B    C    D
1/4    2.0    .44    5.06
3/8    2.5    .50    5.31
1/2    2.5    .63    5.62
3/4    3    .75    6.17
1    3    1.00    9.25
1.5    4    1.12    11.12
2    4    1.12    11.2		  
           
           
           
           
           
           

Note: Dimensions are approximate and are subject to change without notice. Request certified dimensions before final product installation.

 
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Customized Pricing & Ordering Information ($USD)

To show prices:

Click on a size: 		1/4" RVi20P-02T 3/8" RVi20P-03T 1/2" RVi20P-05T 3/4" RVi20P-07T
1" RVi20P-10T 1 1/4" RVi20P-12T 1 1/2" RVi20P-15T 2" RVi20P-20T
 
To price or order, first select a size above.

 

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Product Specs
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Categories:  Pressure Regulators · Back Pressure Regulators · Relief Valves · Strainers

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