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Hayward Industrial Products Installation, Operation, & Maintenance of True Union Valves

Hayward Industrial Products Installation, Operation, Maintenance of True Union Ball Valves
Please read the following information before installing and using Hayward Valves, Strainers, Filters, and other associated products. Failure to follow these instructions may result in serious injury.

  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. Customers 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 depends on material selection and 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 before 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 thermal expansion and contraction effects.
  7. Because P.V.C. and C.P.V.C. 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 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.

Socket Connection:

Socket end connections are manufactured to ASTM D2467-94. Solvent cementing of socket end connections to pipe should be performed per ASTM specifications D2855-87. Cut the pipe square. Chamfer and deburr pipe. Surfaces must be cleaned and free of dirt, moisture, oil, and other foreign material. Remove assembly nuts and end connectors from the valve body. Slide assembly nuts, with threads facing the valve, onto the pipe to which the end connector is to be cemented. Apply primer to the inside socket surface of the end connector. Never allow primer or cement to contact the valve ball or end connector o-ring sealing surfaces, as leaking may result. Use a scrubbing motion. Repeat applications may be necessary to soften the surface of the socket. Next, liberally apply primer to the pipe's male end to the socket depth length. Again apply to the socket; without delay, apply cement to the pipe while the surface is still wet with primer. Next, apply cement lightly but uniformly to the inside of the socket. Apply a second coat of cement to the pipe, and assemble the end connector to the pipe, rotating the end connector 1/4 turn in one direction as it is slipped to full depth onto the pipe. The end connector should be held for approximately 30 seconds to allow the connection to "set." After assembly, wipe off excess cement. Full set time is a minimum of 30 minutes at 60 to 100 F. Full cure time should be based on the chart below.

Joint Cure Schedule:

The cure schedules are suggested as guides. They are based on laboratory test data and should not be considered the recommendations of all cement manufacturers. Individual manufacturer's recommendations for their particular cement should be followed.

Test pressure for pipes
Sizes 1/2" to 1-1/4"
Test pressure for pipes
Sizes 1-1/2" to 3"
Test pressure for pipes
Sizes 4" & 5"
Test pressure for pipes
Sizes 6" to 8"
Temperature Range During Cure Period (B) °F (°C)Up to
180 PSI
180-370 PSI
(1240-1550 kPa)
Up to
180 PSI
Above 180-315 PSI
(1240-2172 kPa)
Up to
180 PSI
(1240 kPa)
Above 180-315 PSI
(1240-2172 kPa)
Up to
180 PSI
Above 180-315 PSI
(1240-2172 kPa)
60 to 100 (15 to 40) 1 hour6 hours2 hours12 hours6 hours18 hours8 hours1 days
40 to 60 ( 5 to 15)2 hours12 hours4 hours1 days12 hours36 hours16 hours4 days
20 to 40 (-7 to 5)6 hours36 hours12 hours3 days36 hours(A)4 days (A)3 days (A)9 days (A)
10 to 20 (-15 to 7)8 hours2 days16 hours4 days3 days (A)8 days (A)4 days (A)12 days (A)

Colder than 10°F (-15°C) Extreme care should be exercised on all joints made where pipe, fittings, or cement is below 10ºF.
A: It is important to note that at temperatures colder than 20ºF on sizes that exceed 3", test results indicate that many variables exist in the actual cure rate of the joint. The data expressed in
these categories represent only estimated averages. In some cases, a cure will be achieved in less time, but isolated test results indicate that even longer periods of cure may be required.
B: These cure schedules are based on laboratory test data obtained on Net Fit Joints (N.E.T. FIT=in a dry fit the pipe bottoms snugly in the fitting socket without meeting interference).

Threaded Connection:

Threaded end connections are manufactured to ASTM specifications D2464-88. F437-88 and ANSI B2.1. Wrap pipe threads with Teflon® tape of 3 to 3-1/2 mil thickness. The tape should be wrapped clockwise, starting at the first or second full thread. Overlap each wrap 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. Pipe sizes 2" and greater will not benefit from more than a second wrap due to the greater thread depth. To provide a leakproof joint, the pipe should be threaded into the end connection "hand tight." Using a strap wrench only. (Never use a Stillson-type wrench) tighten the joint an additional 1/2 to 1-1/2 turns past hand tight. Tightening beyond this point may induce excessive stress that could cause failure.

Flanged Connection:

Flange bolts should be tight enough to slightly compress the gasket and make a good seal without distorting or putting excessive stress on the flanges.
Suitable washers should be used between the bolt head and flange and the nut and flange. Bolts should be tightened in an alternating sequence.

Flange SizeBolt DiameterTorque ft. lbsFlange sizeBolt DiameterTorque ft. lbs.


Remove the assembly nut and end connector from the "adjust" end of the body, or the complete valve body from the piping system. The front face of the seal retainer indicates which direction of rotation tightens or loosens the seal retainer, with the word "tighten" and a directional arrow and the word "loosen" and a directional arrow. The direction of rotation may vary depending on the date of manufacture. The Assembly nut should be installed on the valve "hand tight." Using a strap wrench, only the joint may be tightened 1/2 to 3/4 of a turn past hand tight.


Follow the adjustment sequence and information above, but rotate the seal retainer completely in the "loosen" direction and remove it from the valve body. The o-rings and seals are now accessible for replacement using a "seal" repair kit. Carefully remove the o-rings from their respective locations taking care not to scratch their sealing surfaces. Insert o-rings and re-assemble.

Title: Hayward Industrial Products Installation, Operation, & Maintenance of True Union Valves
Description: Installing and using Hayward valve, strainers, filters, and other associated parts.
Published: 6/2/2008
Last Edited: 1/20/2023
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