Valves

On Pipes

Diverter Valves

Motorized Valve Actuators can be screwed on top of a diverter valve for a pool automation system to change the valve position.

Diverters and check valves use the same body from a manufacture. You can change a check valve into a 2-way diverter or the reverse without cutting out the body and changing it. Check you are getting the correct size parts for the body size you have installed.

Jandy

Jandy has two lines of high quality diverter valves - Grey and Never Lube. Both types of valves work the same way. The Grey valve has a grease cap that can be lubed without any dis-assembly. The Never Lube Valve is completely maintenance-free.

The valves come in 2 port and 3 port models. Both models are available in 1.5" x 2" and 2" x 2.5" sizes. The Never Lube is also available in 2.5" x 3" size.

This Jandy Parts Catalog has a complete list of valves and replacement parts.

Pentair

Pentair diverter valves are lube-free and never require lubrication. There are 2-way and 3-way models that accepts 1 1/2 in., 2 in., and 2 1/2 in. slip outside PVC plumbing.

Pentair diverters have a Fiberglass reinforced handle and can withstand pressure up to 150 psi.

Hayward

Hayward Diverter Valve

Hayward has 2-way and 3-way diverter valves in 1.5" x 2" and 2" x 2.5" sizes in CPVC and PVC materials.

Fixing Diverter Valve Stripped Screw Holes

Take the top off the valve^[1]
Take a screw and coat it with Vaseline
Fill the screw hole with epoxy
Screw the screw in the hole
Wait until the epoxy is almost set and back out the screw
Wait until the epoxy full cures and put the top back on.

You do have to make sure not to let the epoxy set above the top of the screw hole.

Fill both holes completely with putty and let dry, then drill a pilot hole and then create new threads with the screw.^[2]

Tips on Preventing Stripped Screws on Diverter Valves

When installing the screws, turn the screw counterclockwise until it drops into the original threads and then go clockwise to tighten. Crossthreading will ruin the threads quickly.^[3]
When installing an actuator, use the same manufacturer as the valve. The screw threads are different for different manufacturers and the screws will not go into the same threads. The original plastic threads will be damaged unless the threads match exactly.

Replacing Broken Grease Plug in Jandy Grey Diverter Valve

You can buy the diverter kit that converts the valve to a NeverLube and includes a red plug to go in the grease cap hole or you can buy a replacement grease cap.^[4]

The thread is 1/8" NPT and you can use a brass or plastic plug and buy the entire new Jandy valve and pull out the entire assembly from the body and install it into the existing valve.

Ball Valves

You can usually identify the manufacturer of a ball valve by it's handle.

Jandy Ball Valve

Jandy has a line of Gold Standard Ball Valves with 1 1/2' and 2" with unions and 3/4' to 4" without unions.

Praher Ball Valve

Praher has a line of ball valves.

Repairs

You can buy new insides for the praher valves, easy swap out. You may need to buy an identical valve and use the internals.

Knife Gate Valves

Valterra Gate Valve

Check Valves

Flapper Check Valves

Jandy, Pentair, Hayward, and others all make flapper check valves that close using a spring. While they are all similar the internal parts are different. So you need to replace the flapper and lid assembly to match the brand housing you have glued into your pipes. The manufactures use different shaped flappers and springs.

Jandy has three sizes of check valve housing:

1½” - 2” Valve - designed for both 1½” and 2” pipe. 1½” pipe slip-fits into valve ports. 2” pipe is joined using a 2” pipe coupling, a 45 degree elbow, or a 90 degree elbow.
2” - 2½” Valve - designed for both 2” and 2½” pipe. 2” pipe slip-fits into valve ports. 2½” pipe is joined using a 2½” pipe coupling, a 45 degree elbow, or a 90 degree elbow.
2½” - 3” Valve - designed for both 2½” and 3” pipe. 2½” pipe slip-fits into valve ports. 3” pipe is joined using a 3” pipe coupling, a 45 degree elbow, or a 90 degree elbow.

Jandy has a 180 degree housing where water flows straight through and a 90 degree housing where water flow makes a turn.

The internal valve assembly must be removed prior to gluing the valve body to pipe fittings. Make certain no glue enters the valve body beyond the ports. WELD-ON 724 CPVC GRAY IS RECOMMENDED.

Valve mounting for vertical installations is critical. Both Jandy Check Valve Installation Manuals say the Check Valve can be installed in horizontal piping runs or vertical piping runs with the flow running upward.

The Jandy Check Valve Installation Instructions contains the following chart:

The Jandy Pro Series Spring Check Valve Installation Instructions has a different chart:

Refer to the Jandy Check Valve Installation Instructions or Jandy Pro Series Spring Check Valve Installation Instructions for additional installation details.

Many check valves are installed on vertical pipes with downward flow which is not recommended in the Jandy Check Valve Installation Instructions.^[5] The spring, gravity, and the weight of the water should all be working to keep the flapper closed.

Swing Check Valves

Spring Check Valves

Pentair/Ortega makes spring check valves that are used for downward water flow in spa returns.

Check valve springs can be 1lb or 3lb with 1lb the most commonly used. There are some special cases where the outlet has enough pressure drop that tends to keep the check open that you need the 3lb spring.

Spring check valves with a 1/4lb spring can be used with a spa air blower to reduce the risk of water getting back to the blower.^[6]:

Flo Control Air Blower 1-1/2" x 2" 1/4 lb Sping Check Valve 1050-C2
Magic brand Pool Spa Air Blower Check Valve 1-1/2" - 2" 1/4 lb Spring.
Air Supply Silencer Check Valve 1/4 lb. Spring 1.5" I.D 2.0" O.D - 112500

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Multi-Purpose Valve (MPV)

See MPV Valves

Slide Valves

See Slide Valves

Thread Types

There are confusing three letter and four letter acronyms that describe the type of threads on a fitting. The correct threads needs to used for screw in fittings to have a tight, strong, and leak proof connection. Common types used in pool plumbing are:

S- generally means a slip fitting that is not threaded and must be glued
FPT - female(internal) pipe thread.
MPT - male(external) pipe thread

FPT and MPT are types of National Pipe Threads FPT and MPT are tapered for sealing, often without any thread sealant.

PT, NPT, FPT acronyms have the same meaning for American National Standard Pipe Threads. Female NPT threads can be designated as FPT and male NPT threads can be designated as MPT.

Definition of Pipe Thread Acronyms contains other acronyms,

@@ Line 106: / Line 106: @@
 Check valve springs can be 1lb or 3lb with 1lb the most commonly used. There are some special cases where the outlet has enough pressure drop that tends to keep the check open that you need the 3lb spring.
+Spring check valves with a 1/4lb spring can be used with a spa air blower to reduce the risk of water getting back to the blower.<ref>https://www.troublefreepool.com/threads/check-valve-for-blower.223018/post-1953965</ref>:
+*[http://www.inyopools.com/Products/00100028006837.htm Flo Control Air Blower] 1-1/2" x 2" 1/4 lb Sping Check Valve 1050-C2
+*[https://magicplastics.com/magic-plastics-products/compact-air-check-valves/?portfolioCats=31 Magic brand Pool Spa Air Blower Check Valve] 1-1/2" - 2" 1/4 lb Spring.
+*[http://www.inyopools.com/Products/00400125042788.htm Air Supply Silencer Check Valve] 1/4 lb. Spring 1.5" I.D 2.0" O.D - 112500
+[[File:Check Valve Air Blower.jpg|thumb]]
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Difference between revisions of "Valves" - Further Reading

Revision as of 21:03, 2 January 2023

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