Slide valve Type 3111 (normally closed) and 3115 (normally open)



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excess flow, flowline pilot


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Types 3100, 3105

Types 3100.M002, 3105.M002

Types 3101 – 3109

Types 3111, 3115

Types 3111.M002, 3115.M002

Types 3160 – 3167

Types 4100, 4105

Types 4101 – 4107

Types 4111, 4115

Types 4160, 4165

Pilot-operated, three port, two position slide valve with a spring-return action
Special high pressure seals prevent leakage
NACE Standard MR-01-75 compliance

Slide valves Type 3111 (normally closed) and 3115 (normally open) are pilot-operated, three port, two position valves with a spring-return action. Manifold mounted versions are also available.

A major feature of the valve design is elimination of the continuous leakage which is characteristic of conventional lapped-face spool valves. The valve incorporates special high pressure seals which prevent leakage.

The valve slide (which can be supplied either normally closed or normally open) has a ‘block before bleed’ action. In a normally closed valve, for example, this means that the tank port is isolated before pressure and service ports are interconnected.

The valve body has a fourth connection (port 2) for a pressure gauge. If this port is not used, it must be sealed with a 1/4" NPT plug (not supplied with the valve).

Performance curve



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

Operating parameters

Working pressure 690 bar (10,000 psi) max.
Pilot pressure – minimum 4.5 bar (65 psi)
Pilot pressure – maximum 17.2 bar (250 psi)
Operating media – main slide Mineral oils, water, water-glycol mixtures
Operating media – pilot section Air, natural and sour gases or any of the main slide media above.
Recommended filtration 25 micron
Connections 1/4"NPT F all ports
Flow rate, nominal 27 litres/min (6 imp galls/min)
Pressure drop See performance curve
Working temperature – standard –20°C to + 130°C
Working temperature – arctic Available on request
Weight 3Kg

Port assignments

Port Valve 3111 Valve 3115
Port 1 Pilot Pilot
Port 2 Guage Guage
Port 3 Service Service
Port 4 Supply Tank
Port 5 Tank Supply

(c) Marshalsea Hydraulics Limited – a member of the Bifold Fluidpower group of companies.

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