SWITCH HYDRO-PNEUMATIC PRESSURE QKY-21.25 (C0611411-58S), BOP SYSTEM, KOOMEY, ACCUMULATOR UNIT FK2403 8BOTTLES 40GALLON

The liquid-pneumatic switch is a two-position two-way reversing valve that controls the start and stop of the pneumatic oil pump.

The main components of the QKY21-25 hydraulic switch include:

Connection flange, gasket, press sleeve, nameplate, sealing seat, gasket, vent joint, lock nut, back nut, support core sleeve, connecting sleeve, core rod, spring, support sleeve, retaining ring, valve seat, O-ring sealing ring.

The NPT3/4 interface of the valve seat is connected to the oil circuit of the accumulator, the NPT1 interface of the connecting flange is connected to the pneumatic pump, and the NPT1 interface of the joint is connected to the air source. The oil pressure of the accumulator acts on the core rod. When the hydraulic oil pressure drops to 17.85Mpa, the hydraulic pressure acting on the core rod is less than the spring force, and the core rod, the sealing seat and the gasket move up together under the action of the spring force. At the same time, the air circuit is connected, and the compressed air enters the pneumatic oil pump through the ventilation joint and makes it work. The pressure oil discharged by the pneumatic oil pump enters the system. When the system pressure rises to 21MPa (3000psi), the hydraulic pressure acting on the core rod is greater than the spring force, so that the core rod moves down, and the air circuit is closed at the same time, and the compressed air cannot enter through the ventilation joint. Pneumatic oil pump, the pneumatic oil pump stops working.