Differential By-pass Valves
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Noise can be present in a multiple-actuator manifold if only one or two actuators are open. The pump is sized for
the total flow rate and highest pressure drop of all the circuits. With just one or two circuits calling for heat, the pump is
oversized, possibly causing noise. The Pressure Differential By-pass Valve eliminates water velocity noise and water
hammer. With this valve, high-pressure pumps cannot exceed actuator close-off pressure. Pump life increases because
of minimal pressure surging as actuators open and close. There is always correct and constant flow regardless of the
number of actuators open.
The valve adjusts from 2.18 psi (5.0 feet water) to 11.6 psi (26.8 feet water) using a graduated knob. Water by-pass
capacity is 0.6 gpm to 9 gpm. Maximum pressure is 145 psi, maximum temperature is 230°F. The knob is set and
locked with a set screw to prevent tampering.
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