Solenoid Valves - IOM
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1. Hayward guarantees its products against defective material and workmanship only. Hayward assumes no responsibility for damage or injuries resulting from improper installation, misapplication, or abuse of any product. 2. Hayward assumes no responsibility for damage or injury resulting from chemical incompatibility between its products and the process fluids to which they are subjected. Compatibility charts provided in Hayward literature are based on ambient temperatures of 70F and are for reference only. Customer should always test to determine application suitability. 3. Consult Hayward literature to determine operating pressure and temperature limitations before installing any Hayward product. Note that the maximum recommended fluid velocity through any Hayward product is five feet per second. Higher flow rates can result in possible damage due to the water hammer effect. Also note that maximum operating pressure is dependent upon material selection as well as operating temperature. 4. Hayward products are designed primarily for use with non-compressible liquids. They should NEVER be used or tested with compressible fluids such as compressed air or nitrogen. 5. Systems should always be depressurized and drained prior to installing or maintaining Hayward products. 6. Temperature effect on piping systems should always be considered when the systems are initially designed. Piping systems must be designed and supported to prevent excess mechanical loading on Hayward equipment due to system misalignment, weight, shock, vibration, and the effects of thermal expansion and contraction. 7. Because PVC and CPVC plastic products become brittle below 40F, Hayward recommends caution in their installation and use below this temperature. 8. Published operating torque requirements are based upon testing of new valves using clean water at 70F. Valve torque is affected by many factors including fluid chemistry, viscosity, flow rate, and temperature. These should be considered when sizing electric or pneumatic actuators. 9. Due to differential thermal expansion rates between metal and plastic, transmittal of pipe vibration, and pipe loading forces DIRECT INSTALLATION OF METAL PIPE INTO PLASTIC CONNECTIONS IS NOT RECOMMENDED. Wherever installation of plastic valves into metal piping systems is necessary, it is recommended that at least 10 pipe diameter in length of plastic pipe be installed upstream and downstream of the plastic valve to compensate for the factors mentioned above. Hayward True Union plastic solenoid valves are designed for process systems requiring an instant ON-OFF actuated valve. They are designed for FAIL CLOSEӔ service and will provide bubble-tight shutoff in the event of an electrical failure. The valves are manufactured from PVC (Polyvinyl Chloride) or CPVC (Chlorinated Polyvinyl Chloride) and will operate safely at pressures and temperatures as shown on the chart below. The valves are two-way direct acting, normally closed. They can be used for pressurized service to 120 PSIG, vacuum service to 26 HG or drainage applications. They do not require any line pressure to aid in opening or closing. There are no minimum pressure requirements. The TRUE UNION Design allows for ease of removal from the piping system without having to disconnect any piping or electrical connections. Visual inspection of the valve DIAPHRAGMS or replacement of the SEAL CARTRIDGE is recommended at fifty thousand cycle intervals to assure trouble free operation. > 1. UL & CSA approved NEMA IV coil. 2. 100% or Continuos duty cycle operation. 3. TRUE UNION Design: Valve body can be removed without piping or electrical disconnection. 4. Body Mounting Lugs: For laboratory or panel mount. Voltage 12 VAC Current 1.6 amp Voltage 12 VDC Current 0.8 amp 24 VAC 0.8 amp 24 VDC 0.8 amp 120 VAC 1.6 amp 220 VAC 0.9 amp > All plastic construction: No metal parts in contact with process fluid. > 1. The valve should be installed in an accessible location. This will allow for ease of inspection or service. 2. Reliable electrical line voltage supply must be provided to the coil, per table below. Low line voltage will reduce the operating performance and possibly the service life of the coil. > It is recommended that a Hayward ԓY-STRAINER be installed upstream of the valve to prevent clogging or premature wear of the diaphragms due to suspended solids in the process fluid. >

HOW IT WORKS: The Hayward Solenoid Valve is a TWO-WAY, DIRECT ACTING, NORMALLY CLOSED (fail close) actuated valve. When the solenoid coil is energized, a magnetic field is created which generates an upward pulling force on the valve piston, causing it to open. When the coil is de-energized (electrical power shut-off) both the piston spring and the force of inlet pressure an the piston seal close the valve. It must be understood that there are LIMITS as to how much force the operator can overcome to operate properly. These limitations are governed by the following: 1. The maximum "pull-in"...

TROUBLE SHOOTING SHOULD THE SOLENOID VALVE FAIL TO OPERATE AS EXPECTED, CHECK THE FOLLOWING:: 1. VALVE WILL NOT OPEN : a) Check electrical supply and connections. Be sure valve supplied is rated with the correct voltage b) Inlet pressure is too high. (exceeds 120 PSIG) c) Solenoid coil is burned out. (typically the result fluid leaking into the coil from ruptured diaphragms caused by excessive dirt in the process, or the result of water hammer). d) Valve orifice clogged. 2. VALVE WILL NOT CLOSE : a) System has a flow restricting device installed downstream inducing high backpressure (i.e....