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Plastic Adjustable Pressure Relief Valve

Rvi20-P Plastic Adjustable Low-Pressure Relief Valve

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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

Printable
Product Specs Instructions

Rvi20-P Plastic Adjustable Low-Pressure Relief Valve

view prices order

Printable
Product Specs Instructions

View Pricing/Ordering Instructions

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

Applications

Options

Features

Principle of Operation

Dimensions/Material Item List

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.

See pricing Table to select available options

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.

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

#	Item	Materials
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

A	B	C	D
Dimensions (inch)
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.

Rvi20-P Plastic Adjustable Low-Pressure Relief Valve

Rvi20-P Plastic Adjustable Low-Pressure Relief Valve

To View Prices in $USD Start Here (First Select Size)

Applications

Options

Features

Principle of Operation

Dimensions/Material Item List