These flowline pilot valves are pilot-operated, three port, two position valves with a spring return action. The pressure at which the valve functions is variable by adjusting the spring force – a wide range of pressure settings is covered by using seven interchangeable sensing head assemblies.

The pilots can be supplied with either nomally open or normally closed slide configurations, and function with a ‘block before bleed’ action. The pilots are used to switch a pneumatic or hydraulic control pressure on rising or falling flowline pressures in pipeline valve and wellhead safety control systems.

Construction materials, predominantly 316 stainless steel and CA104 aluminium-bronze, and seals of fluoroelastomers and PTFE materials ensure high corrosion resistance and comply with NACE Standard MR-01-75 (latest revision as applicable).

Port assignments

Port	Type 20XX	Type 21XX

Performance curve

Operating parameters

Control pressure – std.	Gas 17.30 bar (250 psi)
Control pressure – high	Hydraulic fluid up to 400 bar (6,000 psi)
Process pressure	690 bar (10,000 psi) max. 380 bar (5,510 psi) max. – 2x1x only
Operating media	Mineral oils, water, water-glycol mixtures, air, natural and sour gases.
Recommended filtration	25 micron
Connections – controls	1/4"NPT F
Connections – process	1/2" or 3/4"NPT
Flow rate, nominal	4.5 litres/min (1.0 imp galls/min)
Pressure drop	See performance curve
Working temperature	–20°C to + 130°C
Weight	2.7Kg

Configuration options

Type No.		Pressure		Process
N/O	N/C	(bar)	(psi)	connection