Vacuum Breaker
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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 eight 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. OPERATION: > The HAYWARD VACUUM BREAKER valve will automatically open when the 3/4 N.P.T. threaded end is subjected to a vacuum or zero pressure. It is designed to be installed into a piping system having a maximum line pressure of 150 P.S.I.G. NON-SHOCK, or into the top of a storage tank. The purpose of this product is to act as a venting device to allow rapid drainage of a pipe line, or on a tank, to allow air to enter tank for drainage and to prevent the tank from collapsing as a result of creating an internal vacuum which can occur without the vacuum breaker installed. The Vacuum Breaker will automatically seal when the line pressure or tank pressure exceeds 1 P.S.I.. INSTALLATION: > There are two methods of installation available for this product. ATTACHMENT TO A 3/4Ԕ MALE PIPE NIPPLE > At one end there is a 3/4Ԕ female N.P.T. hole for attachment to a 3/4 male pipe nipple. This threaded connection is manufactured to ASTM specifications D2464-88, F437-88 and ANSI B2.1. Wrap the male pipe thread to which the Vacuum Breaker is to be attached, with TeflonԮ pipe tape of 3 to 3 1/2 mil thickness. Apply the tape to the threads of the male pipe nipple in a clockwise direction starting at the first or second full thread. Overlap each wrap of the tape by 1/2 the width of the tape. The wrap should be applied with sufficient tension to allow the threads of a single wrapped area to show through without cutting the tape. The wrap should continue for the full effective length of the thread. To provide a leak proof joint, the pipe should be threaded into the Vacuum Breaker valve HAND TIGHTӔ. Never use a stilson type wrench or pliers. After hand tightening, the connection can be tightened an additional 1/2 to 1 1/2 turns using a strap wrench only. Tightening beyond this point may induce excessive stress that could cause failure of the valve. SOLVENT CEMENTING INTO A 1 1/2 FEMALE SOCKET PIPE CONNECTION OTHER END OF FITTING PRESSURIZED > The outside diameter of the Vacuum Breaker valve is manufactured to the same diameter as that of 1 1/2Ԕ P.V.C. pipe. The Vacuum Breaker valve can be solvent cemented into any 1 1/2 female P.V.C. fitting, such as a Tee, Elbow, or valve end connector, etc. To install the Vacuum Breaker valve in this manner, the following procedure is to be used: 1. Remove the self adhesive HAYWARD label from the outer surface of the Vacuum Breaker valve. 2. Clean the surface thoroughly, being sure to remove all traces of the label adhesive. Light scuffing with a fine sandpaper or emery cloth is acceptable. 3. The end of the Vacuum Breaker valve having the 3/4Ԕ N.P.T. thread MUST face the pressurized or fluid side of the pipe. 4. Using a scrubbing motion, apply P.V.C. pipe joint primer to the inside of the fitting that the Vacuum Breaker valve is to be installed into. Repeat applications may be necessary to soften the surface of the socket. 5. Carefully apply primer to the OUTSIDE SURFACE ONLY, of the Vacuum Breaker valve, taking care as to not allowing primer to enter either end of the Vacuum Breaker valve openings. Doing so may damage the valve and cause it to malfunction. 6. Lightly apply a good grade of P.V.C. solvent cement uniformly to the inside of the socket connection of the fitting into which the Vacuum Breaker valve is to be inserted. 7. Holding the Vacuum Breaker valve by the end OPPOSITE 3/4 N.P.T., carefully apply a light coat of P.V.C. solvent cement uniformly to the outside surface of the Vacuum Breaker valve, taking care as to not allowing any of the cement to enter either end of the Vacuum Breaker valve openings. 8. Insert the end the Vacuum breaker valve HAVING the 3/4Ԕ N.P.T. into the female socket fitting, using a rotating motion. 9. Allow cement to dry for at least 4 hours before pressurizing system. size="-1">