STC 2DS200-3/4-2A-D 3/4" NPT Pilot Diaphragm Solenoid Valve, 24VAC

3/4" NPT SLOW CLOSING Anti-Water Hammering Normally Closed, PILOT Diaphragm Stainless Steel Solenoid Valve, 24VAC, CE, H CLASS, Din C

To open: when the valve receives an electrical signal, a magnetic field is formed which attracts the plunger covering the pilot orifice to lift off, causing system pressure (holding the diaphragm/piston closed) to drop. As system pressure on the top of the diaphragm/piston is reduced, full system pressure on the other side of the diaphragm/piston acts to lift the diaphragm/piston away from the main orifice, which allows media flow through the valve. Since the bleed orifice is dimensionally smaller than the pilot orifice, the system pressure can t rebuild on the top of the diaphragm/piston as long as the pilot orifice remains open.

To close: when the valve is de-energized, it releases its hold on the plunger. Then the plunger drops and covers the main orifice. The system pressure builds up on the top of the diaphragm/piston through the bleed orifice, forcing the diaphragm/piston down until it covers the main orifice and stops media flow through the valve.

Features:

• 2-Way, Slow Closing Pilot Diaphragm
• Normally Closed
• Option: Normally Open
• Body: 304 Stainless Steel
• Seal: NBR
• Operating Temperature: NBR Seal: 14 to 176°F
• Ambient Temperature: 23 to 110°F
• Operating Pressure: AC: 4 to 175PSI
• Coil Power: 12 to 20W
• Coil: Class H, IP65
• Services: Air, Oil, Gas, Water
• Cv = 7; Orifice = 20mm