Spool Control Valves inherently leak allowing cylinders to drift.  The inclusion of a P O Check Valve in the circuit will positively lock a cylinder in position.


  • Single or Dual Valves.  Lock one or both ends of a cylinder respectively.
  • O Ring on Piston.  Isolates the pilot system and reduces losses in low flow systems.
  • Flat on Piston.  Speeds up valve closing on circuits with long hoses.
  • Ratio.  Standard ratio 3:1 – others available on request.
  • Vented Valves.  Prevent chattering or hunting caused by system back pressure.  Only available on single versions.
  • Soft Seats.  For leak-tight holding on low volume systems over long periods, e.g. workholding.

Valve Details:

Alt Text
Single Pilot Operated Check ValvesSize (BSP)
V-101Line Mounted1"
V-137Line Mounted1"
V-201Line Mounted1/2",3/4"
V-221Line Mounted, Vented3/8",1/2",3/4"
V-336Line Mounted1/2",3/4"
V-337Line Mounted1/2",3/4"
V-337 YLine Mounted1/2",3/4"
V-411Line Mounted, Vented1/4",3/8",1/2"
V-427-BLine Mounted3/8"
V-434-AManifold Mounted1/4"
V-434-BManifold Mounted3/8"
V-436Line Mounted1/4",3/8",1/2"
V-437Line Mounted1/4",3/8",1/2"
V-437 YLine Mounted1/4",3/8",1/2"
V-457-ABanjo Mounted1/4"
V-457Banjo Mounted3/8",1/2"
V-464-ABanjo Mounted1/4"
V-464Banjo Mounted3/8",1/2"
V-9510Weldable, thru' ported3/8"
V-9610Line Mounted, High Pressure, 700 bar3/8"

Dual Pilot Operated Check ValvesSize (BSP)
V-338Manifold Mounted1/2",3/4"
V-339Line Mounted1/2",3/4"
V-426Line Mounted1/4",3/8",1/2"
V-429Line Mounted1/4",3/8"
V-438Manifold Mounted1/4",3/8",1/2"
V-439Line Mounted1/4",3/8",1/2"
V-453-ABanjo Mounted1/4"
V-453Banjo Mounted3/8",1/2"
V-486Line Mounted, Ideal for Cylinders1/4", 3/8", 1/2"
VC-486_75Weldable 3/4" OD Pipe3/8"
VC-486 18mmWeldable 18mm OD Pipe3/8"
V-738Manifold Mounted1/4",3/8"
V-9490Line Mounted, Twin, Dual PO Check3/8"