To display pricing, print or e-mail a quotation or order, you must follow these basic steps:+ Click here for general instructions
+ Click here for product-specific instructions- Close product-specific instructions

Use this page to print a price quote, e-mail a quote to someone or to yourself, or to order
Note E-mailing a quote to yourself speeds up the ordering process when you click on the link as it remembers the exact material combinations you selected, which you would have to reselect if you just print a hard copy. Save paper by E-mailing.

Follow these simple steps to use this page:

1.) Type in the desired quantity you wish to quote, e-mail or order online (See footnote below)

2.) Update the quantity to apply a quantity discount, if applicable

3.) Type in a pre-assigned approved discount code if you were given one

4.) Next do this"Click Here to apply discount "

4.) Click on any one of these tabs: Print This Page, or E-mail This Page, or Proceed To Order/Checkout
The E-mail feature allows you to generate the price quote which you will immediately receive in your in box which you can easily retrieve later. A separate quote number will be assigned to each item which can be referenced on future orders.

5.) A final part number will not be assigned until the selection becomes an order and it will appear on the invoice and product nameplate

6.) Follow additional instructions from the next pages

Note! Printing or e-mailing a quote cannot generate an order.
The ordering process can only be started by clicking the Order/Checkout button
and you must have your credit card in front of you.
When not ordering by credit card you must include a printout of the specific options displayed on this page, otherwise we cannot proceed with the order

RVL20-EX Exotic Alloy Low Pressure Angle Relief Valve

View Pricing/Ordering Instructions

view prices order

Hastelloy, Titanium, Monel or Alloy 20 body
1/4"-2" NPT THD (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 pressures in multiple spring ranges (See pricing table below)

Printable
Product Specs Instructions

RVL20-EX Exotic Alloy Low Pressure Angle Relief Valve

view prices order

Printable
Product Specs Instructions

View Pricing/Ordering Instructions

Hastelloy, Titanium, Monel or Alloy 20 body
1/4"-2" NPT THD (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 pressures in multiple spring ranges (See pricing table below)

Applications

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. This diaphragm valve can also be used for bypassing fluids or gases. Only clean liquids and gases are recommended. When liquids contain debris or other solid matter that might cause improper operation of the diaphragm valve, a filter or strainer with a fine wire mesh should be installed before the inlet of the valve. Basket strainers or filters can be purchased from Straval to solve this problem. This valve is used where accurate set pressures must be maintained. This is made possible because of the large diaphragm area used to sense the inlet pressure. Compared to higher-pressure piston models, this valve has a very low hysteresis between opening and closing pressures. See available orifice sizes and flow Cv below.

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

Body: Hastelloy, Titanium, Monel or Alloy 20
Elastomeric diaphragm: Choice of different elastomers includes reinforced Teflon, Viton, Buna, and EPDM (most materials always in stock).
Spring chamber: Standard construction is stainless steel. Can be upgraded
Right-angle porting: Side inlet, bottom outlet is standard with this diaphragm valve manufacturer's model. For in-line ported diaphragm valve model RVi-20-EX which is usually the more preferred piping arrangement that we generally stock, so deliveries are shorter, and are also usually priced less . Special threads or ANSI and sanitary flanges (tri-clamp flanges) 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.

Exotic Alloy Relief Valve

RVL-20 Exotic Alloy Relief Valve

Material List and Specification

#	Item	Materials
1.	Adjusting screw	St. Steel (or upgrade)
2.	Lock nut	St. Steel (or upgrade)
3.	Spring chamber	St. Steel (or upgrade)
4.	Spring pusher	St. Steel (or upgrade)
5.	Spring	St. Steel (or upgrade)
6.	Spring Carrier	St. Steel (or upgrade)
7.	Diaphragm	Teflon/ Viton/ Buna
8.	*Body	Hastelloy, Titanium, Monel Alloy 20,

*Body also available in PVC, Monel, Teflon, and Hastelloy (most sizes)

Dimensions

A	B	C	D	E
Dimensions (inch)
1/4	2.38	1.00	.44	5.56
3/8	2.88	1.25	.50	5.59
1/2	2.88	1.25	.63	5.88
3/4	2.88	1.25	1.25	6.69
1	4.25	2.00	1.50	9.62
1.25	4.25	2.00	3.50	11.5
1.5	6.09	3.75	3.50	12.87
2	6.09	3.75	2.63	13.57

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

Instead of voice mail, pls send e-mail messages to customerservice@straval.com

RVL20-EX Exotic Alloy Low Pressure Angle Relief Valve

RVL20-EX Exotic Alloy Low Pressure Angle Relief Valve

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

Applications

Features

Principle of Operation

Dimensions/Material Item List