WRA102BP High Precision Relief Valve

Precision Regulators   1/4" – Basic 3/8" Body

The WRA102BP is a high capacity relief valve that relieves excess pressure in a pneumatic system. The WRA102BP provides greater accuracy than standard  relief valves over a narrow pressure range. The WRA102BP  is an excellent choice for a wide range of precision  applications

Operating Principles
The WRA102BP Regulator uses the force balance principle to open the Relief Valve and vent system pressure when the set point is exceeded. Downstream pressure is transmitted through the Aspirator
Tube to the bottom of the Diaphragm Assembly. When you adjust the range screw for a specific set point, the Positive Bias Spring compresses and exerts a force on the top of the Diaphragm Assembly. As long as the pressure acting on the bottom of the Diaphragm Assembly produces a force less than the spring force acting on the top of the Diaphragm Assembly, the Relief Valve remains closed. When system pressure increases, the force on the bottom of the Diaphragm Assembly increases until it reaches the set point. When system pressure increases beyond the set point, the assembly moves upward, lifting the Relief Valve from its seat
and vents the downstream air. If downstream pressure decreases below the set point, the assembly moves downward closing the Relief Valve.

Specifications
Set Point Range System Pressure (Maximum)
2-200 PSIG 300 PSIG
(0.15-14 bar) (21.0 bar)
(15-1400 kPa) (2100 kPa)
300-400 PSIG 500 PSIG
(21-28 bar) (35.0 bar)
(2100-2800 kPa) (3500 kPa)
Flow Capacity (SCFM) –
40 (68 m3/HR) @ 100 PSIG, (7.0 bar), (700 kPa) System
Pressure
Sensitivity....................... .125" (.005 PSIG) (.32 cm) Water Column
Ambient Temperature................. -40°F to +200°F, (-40°C to +93°C)
Materials of Construction
Body and Housing.............................................................. Aluminum
Trim................................................................Zinc Plated Steel, Brass
Nozzle....................................................................... Nitrile on Dacron