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Pressure Relief, Sustaining or Backpressure Pilot

Lead Free* Models Available


1/2 in


The Model SSPV20DP is a remote sensed, diaphragm actuated Pilot that is used for maintaining a constant differential.

It is normally held closed by the force of the adjustable spring
and low (downstream) pressure above the diaphragm. The high (upstream) pressure is pushing the pilot open. The pilot modulates
toward an open position as the differential pressure increases, in
turn relieving the main valve cover pressure and modulating the
main valve open to maintain the differential set pressure. As the differential pressure decreases, the pilot modulates toward a closed
position, building pressure in the main valve cover and closing the
main valve.

The SSPV20DP senses high control pressure through a tapped port
below the diaphragm and the low pressure through a taped port in the spring cage. The large diaphragm-to-seat ratio allows it to open and close within close pressure tolerances, accurately positioning the Main Valve.

Turning the adjustment screw clockwise raises the differential setpoint. Turning the adjustment screw counterclockwise lowers the
differential setpoint.

The SSPV20DP is equipped with one 1/2 in NPT inlet and outlet port,
a 1/4 in NPT side sensing port located on the power chamber and a
1/4 in NPT sensing port located in the cover. The 1/4 in port in the power chamber is for sensing high (upstream) pressure and the 1/4 in port in the cover is for sensing low (downstream) pressure.

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Disclaimer: Ames product dimensions in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements, please contact Ames Technical Service. Ames reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Ames products previously or subsequently sold.

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*The wetted surface of this product contacted by consumable water contains less than 0.25% of lead by weight.