Pressure regulators maintain established system pressure in the discharge line and at the pump head. It allows excess flow to be by-passed back to inlet of pump, to a tank, or to drain. The pressure regulator also keeps the system at constant pressure in applications where the demand changes or when a trigger gun is released, solenoid (gate) valve is closed or nozzle is clogged, thus by-passing all excess flow.
A wide range of pressure regulators are available including the several models of regulators.
A pressure-sensitive unloader gives all the pressure control of a regulator, plus provides an energy and system savings feature that by-passes flow at low pressure when there is zero demand. This feature is typically only used in applications using shut-off guns because the unloader reacts to the back pressure (pressure spike) caused when the gun is shut off. When the shut-off gun is opened back up the system will return to established pressure.
A latest Pressure Regulating Valve (PRV) is used on Ultra High Pressure pumps both diesel and electric pumping units to divert a portion of the flow to allow pressure outlet. It is really a hand adjusted needle valve, and it can be used to control pressure when the application requires a flow at the low end of the pumping unit’s operating range. For electric units a PRV is required equipment, because the speed of the drive is not adjustable.
The latest design provides: Simple field rebuild using a cartridge unit, down time is two minutes or less. Easy hand adjustment without the need for wrenches, this includes the locking of the adjuster handle, after the pressure is set, all components machined from stainless steel, Direct mounting to fluid end discharge manifold.