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RVi-20 Low-Pressure Accurate Relief Valve

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Stainless Steel & Plastic depending of size ( Pastic Relief Valve can be found here and Hastelloy, titanium, Alloy20, Monel here)
1/8"-1 1/4" NPT THD (For larger models see RVL-20) (Not all materials available in all sizes, See pricing pages)
Accurate relief pressures from 0.50 PSI (0.03 Bar) to 75 PSI (5 Bar)
Adjustable pressure in multiple spring ranges (See pricing table below)

Printable
Product Specs Instructions

RVi-20 Low-Pressure Accurate Relief Valve

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Printable
Product Specs Instructions

View Pricing/Ordering Instructions

Stainless Steel & Plastic depending of size ( Pastic Relief Valve can be found here and Hastelloy, titanium, Alloy20, Monel here)
1/8"-1 1/4" NPT THD (For larger models see RVL-20) (Not all materials available in all sizes, See pricing pages)
Accurate relief pressures from 0.50 PSI (0.03 Bar) to 75 PSI (5 Bar)
Adjustable pressure in multiple spring ranges (See pricing table below)

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 pressure. Pressure relief valve can also be used for bypassing fluids or gases. Only strained or filtered liquids are recommended. When liquids contain debris or other solid matter which might cause the valve seat not to close properly with this type of pressure relief valve, a low-pressure strainer with a fine wire mesh should be installed before the inlet of the valve. Simplex basket strainers or low-pressure filters can be purchased from Stra-Val. 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.

For higher relief pressures see models RVC05 or RVT05

We now offer some models that meet NACE MR0175. These are not priced on line. Consult factory.

See pricing Table to select available options

Low-pressure valve body: Available in a wide variety of alloys and high-performance engineered plastics (see above).
Elastomeric diaphragm: Choice of different low-pressure valve diaphragm elastomers includes reinforced Teflon, Viton, Buna, and EPDM.
Spring chamber: Safety relief valve standard construction is carbon steel as it is non-wetted. Alternates: stainless steel, aluminum, etc.
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. Special threads, flanges, and sanitary connections are also available.

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 . For a true "through flow" model, see our model RVT05 which is a piston type that has three ports.

RVi-20

Material List and Specification

#	Item	Materials
1.	Adjusting screw	Steel & SS
2.	Lock nut	Steel & SS
3.	Spring chamber	Steel & SS
4.	Spring pusher	Steel & SS
5.	Spring	Steel & SS
6.	Spring Carrier	Steel & SS
7.	Diaphragm	Teflon / Viton/ Buna
8.	*Body	303SS & 316SS

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

Dimensions

A	B	C	D
Dimensions (inch)
1/8 & 1/4	2	.44	5.56
3/8	2.50	.50	5.59
1/2	2.50	.63	5.62
3/4	3	.75	6.17
1	3	1.00	9.25
1 1/4	4	1.12	11.12

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

RVi-20 Low-Pressure Accurate Relief Valve

RVi-20 Low-Pressure Accurate Relief Valve

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

Applications

Options

Features

Principle of Operation

Dimensions/Material Item List