Differential & Negative Bias Valves & Regulators
Differential pressure regulators and valves are used in applications to maintain a constant (and specific) pressure differential between the outlet (P2) pressure of the regulator and the signal pressure loaded on the diaphragm. The desired differential can be set with a spring and an air sense line can be added to the dome of the regulator to constantly follow the pressure up and down, while always maintaining the same difference in pressure.
Negative bias pressure regulators and valves operate the same way, except the spring is placed into a state of tension instead of compression.
Pressure Reducing Differential Regulators
Differential Back Pressure Regulators
Common Differential Pressure Control Applications
Seal Pressurization
Differential Pressure Control
Spring loaded differential pressure regulators are used to maintain lubrication or seal media on rotating or reciprocating equipment. The differential is maintained relative to internally sensed turbine or compressor pressures.
Constant Filter Discharge
Differential Pressure Control
By using a spring loaded regulator with remote sensing, a constant discharge pressure after a filter can be achieved regardless of cake buildup.
Flow Control
Differential Pressure Control
A spring loaded regulator with remote sensing can be used to control pressure to a known orifice to achieve and maintain a specific flow rate.
Cryogenic Pressure Build
Differential Pressure Control
Pressure building regulators can be used to maintain pressure in vapor space above cryogenic liquid in Dewar vessels. By using a light spring with low 'droop' assisted by gas pressure, a highly accurate pressure of 275 psig or more is attained. Set-point is capable of accuracies of +/-2 psig.
