BACK PRESSURE-REDUCING VALVE

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Model BPS-09

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Product Specs

PDF Instructions

Pricing

Spring diaphragm operated
1/4"-2" NPT THD
Control pressures to 80 PSI (5.2 Bar)
Stainless steel, and various exotic alloys

Features

Pressure-containing parts made from solid bar stock materials — unlike castings which have wall thickness variations.
Body: Standard materials are stainless steel type 303SS and 316SS. Special alloys (e.g. Monel, titanium, and Hastelloy) also available.
Trim: Stainless steel for main valve is standard. Teflon sealing option is also available for air or gas service.
Teflon-Viton composite reinforced diaphragm is designed for much greater main valve travel than models designed with stainless steel diaphragms. When a Teflon diaphragm is ordered, the Teflon film on the wetted side provides good corrosion resistance for a wide range of fluids and gases including steam. Viton is the elastomeric seal on the non-wetted side. Max temperature rating is 350 °F. Special elastomers are also available. Other diaphragm materials are available
Right-angle porting is the standard piping arrangement which allows the valve to be self-draining.

Applications

This valve is used for back pressure control applications such as maintaining constant pump discharge pressures, bypassing excessive pressures from various types of process equipment, and wherever a constant pressure must be maintained in a process or piping system. Valve can be used for non-corrosive or mildly corrosive fluids, depending on the materials selected. When liquids or gases contain debris or other solid matter which might cause internal clogging or improper operation of the valve, a strainer with a fine wire mesh should be installed before the inlet of the valve. In-line strainer fittings or basket strainers can be purchased from Stra-Val. For gas or air service, a soft-seated version with Teflon or other engineering plastics is available to improve seating performance.

Options

Principle of Operation

This is a direct-acting valve with an adjustable spring operating against a flexible elastomeric diaphragm subjected to the inlet pressure of the valve. Increasing the spring compression will increase the system or line pressure to be maintained. Reducing the spring compression will reduce the system or line pressure to be maintained. An increase in system pressure beyond the set point will cause the main valve to open and relieve the excess pressure.

BPS-09

Material List and Specification

1.	Adjusting screw	Steel
2.	Lock nut	Steel
3.	Spring chamber	Steel
4.	Spring pusher	Steel
5.	Spring	Steel
6.	Lock nut	Steel
7.	Lock washer	Steel
8.	Spring follower	Steel
9.	Diaphragm	TFE / Viton
10.	Diaphragm disc.	Stainless steel
11.	Main valve	Stainless steel
12.	Body	Stainless steel

Alternate elastomers available
Max inlet pressure 75 PSI (5.2 Bar) based on diaphragm rated press. Diaphragm min burst pressure at ambient temp is 300 psi (20 bar)

Dimensions (NPT)

A	B	C	D	E
1/4	2.75	2.50	1.00	6.25
3/8	2.75	2.50	1.13	6.50
1/2	2.75	2.50	1.31	8.25
3/4	2.75	2.50	1.50	9.50
1	4.00	4.50	2	12.38
1-1/4	4.50	4	3.44	13.25
1-1/2	4.50	4.00	3.56	16.56
2	5.00	4.50	4.13	17.25

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" BPS09-02T	3/8" BPS09-03T	1/2" BPS09-05T	3/4" BPS09-07T
To show prices: Click on a size:	1" BPS09-10T	1 1/4" BPS09-12T	1 1/2" BPS09-15T	2" BPS09-20T

To price or order, first select a size above.

Printable
Product Specs

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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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