REF: 9632

Manual valve

SPX Power Team

“TWIN” 4-WAY/3-POSITION (TANDEM CENTER) MANUAL VALVE
Application – Multi-strand, double-acting stressing jacks with an auxiliary seating cylinder.

Actuation – Dual lever operated, detent positioned.

Operation –

With valves “A” and “B” in center position, pump is started; cable is inserted into stressing tool.
Valve “A” is placed in “Stress” position; cylinder extends to tension cable. Pump pressure controls force exerted by tensioning cylinder in this position. “Stress” port is checked internally, and can only be released by building pressure in the valve “B” return position.
When desired cable tension is achieved, valve “A” is placed in valve “B” position and valve “B” in “Seat” position. Seating portion of cylinder will be pressurized to seating pressure controlled by “Seat” relief valve (factory set to 3,900 psi (275 bar)).
Valve “B” is shifted to “Return” position, which is pressure controlled and will not exceed 2,200 psi (155 bar). “Return” portion of stressing tool should be pressurized and will release “Stress” port when pressure reaches 15% of “Stress” port pressure.
“Stress” port will remain open and cylinder will return as long as pressure differential is maintained. “Stress” and “Seat” ports are open to reservoir.
When cylinder has fully returned, both valves are shifted to “Center” position and oil will be directed to reservoir. Maximum pressure setting for the “Seat” relief valve is 6,000 psi (420 bar).