Product Description

A weight loaded pressure relief valve offers a rugged, trouble free design. This model is constructed with a high quality anodized and heat-treated aluminum body that will not rust.

Connection size (A): 2″ MPT
Dimension B: 2.31″
Height, closed (C): 7.81″
Height, fully open (D): 9.25
Weight, 0.5psig: 6″x6″
Weight, 1psig: 8.12″x8.12″
Material of Construction: Anodized Aluminum
Maximum Allowable Set Pressure: 29 psig
Minimum Allowable Set Pressure: 1 psig
Relief Volume at 15 psig: 820 cfm
Relief Volume at 3 psig: 200 cfm

aluminum weighted relief valve diagram

The operation of the weighted blower relief valve is simple. As the service line air pressure reaches the pressure setting, the weight loaded cap is forced upwards off the valve seat. As the pressure increases, the cap rises to expose the discharge ports. The flow through capacity of the valve is such it will relieve the pressure to the desired set point and prevent damage to the blower and other appurtenances. The valve must be sized properly to allow the venting of the excessive flow. If the valve is undersized, excessive pressure could result in the service line.

The blower relief valve automatically reseats itself as the line pressure is reduced.

weighted relief valve diagram
OPERATION: A weighted cap rides on a machined seat, when the pressure exerted on the cap is greater than the weight of the cap plus any weights on the cap. The cap raises to let air escape. The relief valve does not fully relieve until the weight of the cap and the accumulation factor of the valve is exceeded. The accumulation factor is the percent of set point pressure required to initially move the cap. The accumulation factor on these blower relief valves is approximately 25%. The set pressure can be modified by removing or adding weights. Weights are available for both 1 psi and 0.5 psi increments.

INSTALLATION: The relief valve must be mounted in the vertical position to function properly. Overhead clearance must be great enough to allow full travel of the cap. The blower relief valve should be installed on the discharge side of the blower, before any restrictions, and preferably immediately after a silencer if one is used.

MAINTENANCE: Rotate the cap by turning by hand on a monthly basis. Use a light oil on the machined surface of the body (seat) to insure proper operation.

2″ Aluminum Weighted Valve

BOM Number: WRV-2 SKU: N/A Categories: ,


Easy to operate and maintain
Rust-free Anodized Aluminum Body

Shipping Weight: 4 lbs
Shipping Dimensions: 6 × 6 × 7.75 in

Pathfinder Systems

Body Materials:


Connection Size:

2" MPT


An optional lock-out ring can be purchased and installed at the top of the valve stem to deter someone from removing the weights. This is shipped loose with the valve and would need to be installed with a pair of snap ring pliers.

Product Accessories


2″ Weighted Valve