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The fraval valves are generally used in the self-lubricating operation. They find application in almost all sorts of fluid control. These control valves which are self-acting keeps the force at the outlet constant and steady free of the inlet pressure deviations and flow through the valve. This reduces down time of the system and makes for easy restart of the systems. Earlier types of fraval valves were operated manually, but these days the entire operation is mechanised to be able to work automatically at all times. These valves are operated by pneumatic or electrical signals that are generated by measuring stations on the system.