Products
Relief & Back Pressure Valves

Back Pressure Relief Valves

Back Pressure Relief Valves for Liquid service. Relief Valves (Back Pressure Valves) are used to maintain a specific back pressure or to protect systems from an over-pressure condition.

How Back-Pressure Valve Works

The Back Pressure & Relief Valves relieve upstream pressure in a variety of processes. These valves automatically maintain desired maximum pressure in a vessel or system by relieving excess pressure into lower pressure return line or to atmosphere. Ideally suited for use as pump bypass control valve by maintaining constant pump discharge pressures. Used as a continuously operating valve or for protection against intermittent over-pressure conditions.

Controlling Pressure

A Back Pressure Valve is actuated by the system pressure on the inlet side of the valve. Valve loading is provided by a spring. The adjustment is done by removing the cap and rotating the screw clockwise or counter-clockwise.Spring load balances against the opening force of the up stream (or relief) pressure. Valve will open at the slightest increase in pres sure above the spring set point, and will close when the excess pressure has been relieved.

Simple in Design

To adjust set pressure of valve, remove top cap, loosen lock nut and adjust pressure by rotating adjustment screw. Rotating the screw clockwise increases the compression on the spring thereby increasing the set pressure. Rotating the screw counterclockwise lowers the set pressure. Tighten the lock nut and replace top cap and gasket

Simple in Design

To adjust set pressure of valve, remove top cap, loosen lock nut and adjust pressure by rotating adjustment screw. Rotating the screw clockwise increases the compression on the spring thereby increasing the set pressure. Rotating the screw counterclockwise lowers the set pressure. Tighten the lock nut and replace top cap and gasket

Setting Points of Flow

The higher the system pressure is above the relief set point pressure, the more flow the valve will pass. It is therefore typical to specify the maximum capacity of a back pressure relief valve at 10% and 20% over set pressure.

Setting Points of Flow

The higher the system pressure is above the relief set point pressure, the more flow the valve will pass. It is therefore typical to specify the maximum capacity of a back pressure relief valve at 10% and 20% over set pressure.

 
R Series 10691 Series
 3040 Series
SIZES 1/2" - 3" 1/2" - 1" 1/2" - 2"
CONNECTION  NPT  NPT  NPT, 125 & 250 FLG
PRESSURE RANGE  3 - 300 PSIG  3 - 300 PSIG 5 - 250 PSIG

APPLICATIONS
&
CAPACITY

  Liquid -  16 gpm. Liquid -  16 gpm.  Liquid - 278 gpm.
Gases - 2,704 scfm.

RECOMMENDED USES

 Low Capacity
Economical		 Low Capacity
Class IV shut-off		 Medium to High Capacity
Fast Response
3040 Series - RELIEF & BACK PRESSURE VALVES

Water, Liquid, Air: The 3040 Back Pressure Relief Valve offers a much higher capacity than the R Series. Used for Liquid service. Relief Valves protect systems from over-pressurized conditions. Also used for pump protection.The R Series are economically-priced Back Pressure Relief Valves for Liquid service. Relief Valves/Back Pressure Valves are used to maintain a specific back pressure or to protect systems from an over-pressure condition. Also used for pump protection.

R-Series - RELIEF & BACK PRESSURE VALVES

Water, Liquids: Relief & Back Pressure Valves, The R Series & 10691 Series are economically-priced Back Pressure Relief Valves for Liquid service. Relief Valves/Back Pressure Valves are used to maintain a specific back pressure or to protect systems from an over-pressure condition.

10691 Series - RELIEF & BACK PRESSURE

Water, Liquids: The 10691 Series are economically-priced Back Pressure Relief Valves for Liquid service. Relief Valves/Back Pressure Valves are used to maintain a specific back pressure or to protect systems from an over-pressure condition. Also used for pump protection.