Pressure Sustaining Normally Open (PSNO) Valves ship pre-assembled by Netafim USA following strict quality standards. The PSNO Valve consists of a Basic Valve, a Normally Closed Solenoid, a Pressure Sustaining Pilot, and an Accelerator Relay (if the valve is 6” and larger).
- Basic Valve - A basic valve consists of four simple parts - body, spring, diaphragm and bonnet - making it the simplest valve to operate and maintain. Installation is quick and easy with its unique inline design which also creates low losses at high flow rates. Available in two body material options - PVC or Iron - both with a direct sealing natural rubber diaphragm.
- Normally Closed Solenoid - A solenoid valve receives an electric command from a controller and converts it into a hydraulic command to the main valve. This enables the opening and closing of the valve by allowing the passage of water into or from the control chamber of the main valve. PSNO valves are standard with a 24VAC Normally Closed solenoid.
- Pressure Sustaining Pilot - A pilot is a mini-valve which ensures accuracy of the regulated pressure for hydraulic control valves. In PSNO valves, when the line presure is lower than the pilot's spring setting (the set point), the pilot permits the passage of water into the chamber of the main valve, partially closing the vlave. PSNO valves are standard with a Green Pilot Spring and a recommended set point of 45 psi.
- Accelerater Relay - An accelerateor relay is designed with a large flow of passages to allow faster reaction time of the main PSNO valve. As soon as the solenoid is energized, the relay allows larger amounts of water to flow into the main valve chamber, partially closing the valve. It is a standard component on all 6" and larger valves.
