The S4A is a pilot-operated, semi steel bodied valve. The valve may be opened by means of the manual opening stem for servicing or in case of electrical power failure.The Type S4A Solenoid Valve is furnished with FPT Internal NPT (U.S. Standard Taper Pipe Thread), Socket Weld, Weld Neck or ODS (solders over copper tubing of given diameter.. The Type S4A is a pilot operated solenoid. The valve in its closed position, with the solenoid coil de-energized and the plunger needle and main port plug in the seated position. List Price $5,219.00 List Price $5,219.00 As low as $650.13
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Type S4A is a spring closing valve, suitable for use in refrigerant liquid, hot gas or suction lines in a temperature range of -50° to 105°C (-60° to 220°F). Principles of Operation The Type S4A is a pilot operated solenoid. The valve in its closed position, with the solenoid coil de-energized and the plunger needle. Fig 1 S4A Solenoid Valve Operation . 4.1. S4A With the solenoid coil de-energised the main port and pilot valve port are closed, outlet pressure acts above and below the power piston. The closing spring force and the differential between the inlet and outlet pressures combine to keep the main valve port plug closed and prevent flow through the.
