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Pressure Lock Valve

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The l 10 pressure lock valve is a solenoid operated check valve designed for hydraulic elevators and includes a self closing manual lowering valve. Its purpose is to allow free flow of oil from the pump unit a to the cylinder b for upward travel and to prevent flow in the reverse direction from b to a until an electrical signal is given to the solenoid. Installed in the main cylinder line directly adjacent to the main elevator control valve, the l 10 can be employed as a safety back up valve to the down system of the main control valve to prevent unwanted down movement of the elevator should an electrical or mechanical malfunction occur in the main control valve. Another application of the l 10 is to reduce the amount of bounce in a hydraulic elevator system due to the compressibility factor of oil between the cylinder and the control valve, by mounting the l 10 directly onto the cylinder connection. A slack rope valve lk in the case of 1:2 elevators is optional. It prevents the slack rope condition caused by the lowering of the ram when the car is suspended in the safeties or resting on the buffers.

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