What's NEW
-
To display pricing, print or e-mail a quotation or order, you must follow these basic steps:+
Click here for general instructions
1.) Select one of the product groups, spring range for Valves (Perf or mesh for Strainer products)
2.) Click on a spring Range and Cv (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.
4.) By placing your mouse over each option you will see a pop up display with helpful information including temperature limits for that material or option
5.) As you click on each option, you will see the subtotal change. You must click on all available options before proceeding to the next step.
6.) Click on the large "Continue" button to apply quantity and resale discounts, Print, E-mail the quote to yourself, or to Order. You will be given a resale discount code if you are an eligible reseller or OEM.
-
+ Click here for product-specific instructions- Close product-specific instructions
-
Instructions for Pricing/Ordering & Comments
First select a size, then a spring range. Since the Body #8, contains the pressure, select the proper material that is suitable for the fluid or gas used. Next, select the proper diaphragm material #7, which must also be suitable for the media used. The more elastic Buna and Viton Diaphragms tend to seal off better than the harder Teflon (PTFE) diaphragms. Then select the Spring chamber #3, spring hardware #4 & #6, and the adjusting spring #5. These are all isolated (non-wetted) from the fluid media and should be selected based on the external environment the valve is exposed to. The carbon steel spring chamber, when selected, is painted on the exterior and interior to withstand normal atmospheric corrosion. When an aluminum or PVC spring chamber is selected, the internal spring hardware #4 & #6 will be the same material as the spring chamber #3, and the external hardware (adjusting screw #1and lock nut #2) will be a 300 series stainless steel. After the customized selection is made, click to continue and instructions will be provided to either print or save the selection or to proceed with ordering the item on line. Printing the selection will not commit one to ordering the items selected. Should you have any questions on the product capability or product options, or are having difficulty in making the pricing selections or ordering, please contact us by e-mail or phone between 9AM-5PM Eastern time, Monday-Friday. Please note that in most cases the pricing on our In-Line ported model RVi20 may be less expensive than the RVL20 (angle ported model) shown in the pricing table below, for which we also carry more stock in the smaller sizes, resulting ususally in faster deliveries.
To view pricing, typical ship schedules, or place an order, just click on a product tab and make your selection which you can customize. You may print or e-mail yourself a quote 24/7 without factory assistance, or send in a quote request for un-priced items. Check our stock list for quick deliveries.
RVL20-EX Exotic Alloy Low Pressure Angle Relief Valve
view prices
- 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)
RVL20-EX Exotic Alloy Low Pressure Angle Relief Valve
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)
To View Prices in $USD Start Here (First Select Size)
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
| # | 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
| Dimensions (inch) | ||||
| A | B | C | D | E |
|---|---|---|---|---|
| 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.