Low-Pressure Relief Valve - In-Line, Diaphragm Valve - Accurate, Adjustable Relief Pressures - RVi-20

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Model RVi-20

Low-Pressure Relief Valve
In-Line, Diaphragm Valve
Accurate, Adjustable Relief Pressures

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

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Product Specs

PDF Instructions

Pricing

Stainless steel, Teflon, Hastelloy, titanium, Monel, PVDF (Kynar), PVC, or brass body
1/4"-1 1/4" NPT THD
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)

Features

Low-pressure valve body: Available in a wide variety of special 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. For right-angle valve porting (side inlet, bottom outlet) see model RVL-20. Special threads, flanges, and sanitary connections are also available.

Applications

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.

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.

RVi-20

Material List and Specification

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	Orifice max	Cv
Dimensions (inch)				Flow Data
1/4	2	.44	5.56	.125	0.279
3/8	2.50	.50	5.59	.375	2.52
1/2	2.50	.63	5.62	.500	2.98
3/4	3	.75	6.17	.500	4.24
1	3	1.00	9.25	.750	6.39
1 1/4	4	1.12	11.12	1.00	17.9

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" RVi20-02T	3/8" RVi20-03T	1/2" RVi20-05T	3/4" RVi20-07T
	1" RVi20-10T	1 1/4" RVi20-12T

To price or order, first select a size above.

Printable
Product Specs

PDF Instructions

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To display pricing, print or e-mail a quotation or order, you must follow these basic steps:

1.) Select one of the product groups, spring range for Valves (Perf or mesh for Strainer products)

2.) Click on a spring Range (Valves) or Perf or mesh (Strainers). Options will now appear with price adders.

3.) If your pressure units are different from the ones listed, click on the units header "?" to convert.

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