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High-Low Piston (Stick) Pilots for Control Systems

High-Low Piston (Stick) Pilots for Control SystemsWeatherford’s HL-2 high or low pressure pilot is designed to protect equipment and installations against abnormal pressures. It is available in pressure ranges to 15,000 PSI (1034.2 BAR) and can operate as a normally open block-and-bleed high pressure or closed block-and-bleed low pressure device for pneumatic or hydraulic service.

HL-2 pilot bodies and sense heads are available in any combination of the following five materials:

  • 316 SS (standard)
  • Hastelloy
  • Duplex stainless steel
  • Inconel 625
  • Monel 400
Maximum supply pressure 125 PSI (8.5 bar)
Operating temperature -20° to 450°F (-29° to 232°C)
Production test pressure 1.5 x working pressure
Repeatability of set point 1% of set pressure max.
Hysteresis or dead band 10% of full range max.
Material NACE MR-01-75 standards*
Maximum working pressure:
5- to 115-PSI (0.3- to 7.9-BAR) 1,500 PSI (103.4 BAR)
115- to 10,000-PSI (7.9- to 689.5-BAR) 10,000 PSI (689.5 BAR)
*Charpy impact value exceeds 15 ft. lb. (20 N-m) at 75°F (6°C)
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