PILOT VALVE

摘要

A pilot valve permits the delivery of relatively high pressure gas on the order of 30-50 psi directly to the valve. A poppet valve is positioned in the outlet gas delivery tube of the valve housing and has a valve stem which is spring loaded to maintain the valve in the closed position and a high pressure gas is supplied to the poppet valve. A trigger gas in the form of a low pressure gas is supplied to the pilot valve to cause the pilot valve to open. A poppet valve opening mechanism responds to the presence of the trigger gas to move the valve stem of the poppet valve to open the poppet valve and to permit the high pressure gas to pass through the poppet valve and through the pilot valve. A preferred opening mechanism is a diaphragm which moves in response to the trigger gas and causes a backup disk to also move and force a piston against the valve stem of the poppet valve.