PS Series - Pilot Operated Solenoid Valve

For Process Liquid Applications Requiring High Flow Capacity And High Pressure Capability!

Pilot Operated Thermoplastic Solenoid Valve

Inlet Rating 140 PSI -- Back Pressure Rating To 70 PSI.

Superior Features:
  • Normally closed, in-line design with bubble-tight shut-off.
  • High pressures: Particularly for applications where high back-pressures (up to 70 PSI) are required e.g. controlling flow to spray nozzles, high pressure chemical injections, etc.
  • Inlet pressure to 140 PSI.
  • High flow rates - CV.’s from 5.2 on the 1/2" size to 80 on the 3" size.
  • Unique design: Teflon® Bellows barrier type dynamic seal prevents leaking of fugitive emissions to the atmosphere.
  • Safety/Dependability: Patented Fail-Dry® safety design feature provides advance visual warning if seal malfunctions, while permitting valves to continue operating until maintenance can be scheduled.
  • Cycle life in excess of 1,000,000 cycles.


  • Can be used with all type solutions including acids, caustics, solvents and chlorine solutions.
  • Rugged thermoplastic construction is resistant to both internal & atmospheric corrosion.
  • No metal parts in wetted areas.
  • Positive valve closure in the event of electrical failure.
  • Energy-efficient 11 watt coil.
  • Molded coil and standard DIN connector; designed to meet NEMA 4X.
  • Sizes: 1/2", 3/4", 1", 1-1/2", 2" & 3".

Materials of Construction:

Series PS Pilot Operated Solenoid Valves are available with standard delivery in PVC (Type 1, Grade 1) and with slightly longer delivery in CPVC (Corzan ), Polypropylene and PVDF (Kynar®) Consult KTH Sales.


The Series ‘PS’ valve is pilot-operated and normally closed by design. It requires line pressure and flow for operating assistance. Under the correct pressure conditions (see chart below) the coil, when energized (power on), creates an electromagnetic field in the top section of the core tube. This force pulls the core and pilot seat upward, opening the pilot valve.

The liquid pressure above the diaphragm is then vented through the open orifice of the pilot valve to the downstream piping. At this moment, the inlet pressure under the diaphragm lifts the diaphragm and opens the main valve orifice, thereby permitting full flow through the valve.

When the coil is de-energized (power off), the pilot solenoid spring (not in the wetted area) pushes the core and pilot seat downward, closing the pilot valve. This causes pressure above the diaphragm to rise to inlet pressure level, forcing the diaphragm downward against the main valve seat sealing the valve. Note - Series "PS" solenoid valves require a minimum differential pressure of 5 PSI to operate properly. 

Maximum Inlet Pressure @ 75oF:  140 PSI

Maximum Inlet Pressure @ 140oF:  40 PSI

Minimum Inlet Pressure:  5 PSI

Maximum Outlet Pressure:  70 PSI *

(*rating for PVC - other material - consult)


Pom-ps-cut.jpg (67181 bytes)
Flow vs. Pressure Drop Within Valve   Dimensional Information
for Pipe Size CV Factors O.D. of valve Total Height
½" 5.2 3 1/2" diameter 6 5/8"
¾" 7.6 4" diameter 7 9/32"
1" 9.5 4" diameter 7 9/32"
1 ½" 28 6" diameter 9 17/32"
2" 35 7" diameter 9 17/32"
3" 80 9" diameter 11 7/8"

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