High-Low Piston (Stick) Pilots for Control Systems
 Weatherford’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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