Plastic Globe Valve Success?

[boytonstu]

http://www.ebay.com/itm/B-K-1-2-globe-stop-valve-grey-plastic-105-023-Lot-of-5-/231563886651?pt=LH_DefaultDomain_0&hash=item35ea48803b


These inexpensive 1/2" globe valves are unusual because they lack rubber washers to seal. Instead, the cylindrical stem seals against the valve body.

BTW What purpose is the plugged 1/4" threaded side hole used for?

Have you experience with this type of valve?

 

[frodo]

http://www.ebay.com/itm/B-K-1-2-globe-stop-valve-grey-plastic-105-023-Lot-of-5-/231563886651?pt=LH_DefaultDomain_0&hash=item35ea48803b


These inexpensive 1/2" globe valves are unusual because they lack rubber washers to seal. Instead, the cylindrical stem seals against the valve body.

BTW What purpose is the plugged 1/4" threaded side hole used for?

Have you experience with this type of valve?

you dont want a globe valve. it restricks flow of water

http://upload.wikimedia.org/wikiped...-en.svg/1280px-Globe_valve_diagram-en.svg.png

http://www.nivzvalves.com/products/...Class-Catalogue-Drawing-Dimension-Diagram.jpg

http://www.valvestock.co.uk/files/21_dimension_small.jpg


ball valve is the way to go,,globe are crap

the water gets under the washer and makes it chatter

 

[boytonstu]

you dont want a globe valve. it restricks flow of water

http://upload.wikimedia.org/wikiped...-en.svg/1280px-Globe_valve_diagram-en.svg.png

http://www.nivzvalves.com/products/...Class-Catalogue-Drawing-Dimension-Diagram.jpg

http://www.valvestock.co.uk/files/21_dimension_small.jpg


ball valve is the way to go,,globe are crap

the water gets under the washer and makes it chatter

1/2" plastic ball valves are too hard to turn in comparison.

The restricted flow is not a problem.

It must be plastic.

Have you used these plastic globe valves without rubber seals?

 

[phishfood]

When I first got into plumbing 20+ years ago, the company I was working for at the time used something that looked similar in CPVC. They were garbage, and they quit using them rather quickly.

 

[Caduceus]

The plug is a bleeder port for shutting down and relieving pressure downstream of the valve. That's why there is a flow indicating arrow printed on the valve. If you exercise a plastic ball valve before installation and grease it a little before installing, you will get better results when you need to shut it off in the future. Just the same as a brass ball valve. Some people just install them and find them hard to operate later.

 

[boytonstu]

The plug is a bleeder port for shutting down and relieving pressure downstream of the valve. That's why there is a flow indicating arrow printed on the valve. If you exercise a plastic ball valve before installation and grease it a little before installing, you will get better results when you need to shut it off in the future. Just the same as a brass ball valve. Some people just install them and find them hard to operate later.

Thanks for the pressure relief information.

A ball valve is not an option, the valve must have a threaded stem for the intended purpose.

 

[boytonstu]

When I first got into plumbing 20+ years ago, the company I was working for at the time used something that looked similar in CPVC. They were garbage, and they quit using them rather quickly.

Thanks, I don't know if the 20+ year old design is the same as the current builds.

Do you remember how the valves failed?

What valve was used for replacement?

 

[frodo]

Thanks for the pressure relief information.

A ball valve is not an option, the valve must have a threaded stem for the intended purpose.

its called stop and waste. which are illegal fitting under the UPC


because of back siphonage cross contamination

 

[frodo]

1/2" plastic ball valves are too hard to turn in comparison.

The restricted flow is not a problem.

It must be plastic.

Have you used these plastic globe valves without rubber seals?

it would not be a globe valve if it did not have the rubber washer

it would have a ball.

 

[boytonstu]

it would not be a globe valve if it did not have the rubber washer

it would have a ball.

There are several large manufacturers who produce these globe valves without washers.

 

[phishfood]

Thanks, I don't know if the 20+ year old design is the same as the current builds.

Do you remember how the valves failed?

What valve was used for replacement?

As I recall, they would leak around the stem, in what would normally be called the packing. We went to CPVC solvent weld ball valves. The ball valves perform OK, if they are installed correctly.

 

[frodo]

There are several large manufacturers who produce these globe valves without washers.

intrigued,, globe valve with out washer....please upload a diagram of the valve

never heard of one,,,what does it use to "stop" the water ?

 

[boytonstu]

No washer inside.

 

[Mr_David]

Kind of a cross breed between a gate ( with the gate being cylindrical ) and a needle valve.