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Drawing for a miniature quarter turn valve

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Brian Abbott23/06/2019 20:53:12
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387 forum posts
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Hello.

Does anyone know where i can find a drawings for a miniature quarter turn isolation valve ?

Thanks.

Edited By Brian Abbott on 23/06/2019 20:55:51

Brian Sweeting23/06/2019 21:28:53
368 forum posts
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Are you looking for construction drawings or layout drawings, also what size miniature?

Basic valve layout/data .... **LINK**

Edited By Brian Sweeting on 23/06/2019 21:29:20

Brian Abbott23/06/2019 21:41:37
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387 forum posts
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Hello.

I need to make a replacement injector isolation valve, many of the comercial places make them but i need one with a flane mount, what i am after is a design i can adapt.

 

capture.jpg

 

Edited By Brian Abbott on 23/06/2019 21:42:36

Nigel Graham 223/06/2019 21:56:53
363 forum posts

Note that the link opens the details for the sort of valve common on plumbing systems, and these are very simple but highly restrictive to flow.

I sectioned one recovered from 15mm plumbing, to see if it's possible to make a miniature version, and found the port through the ball is half the pipe bore, so one-quarter cross-sectional area!

The operating spindle has a screwdriver-like tip that engages a shallow slot cut across the ball (verify the orientation before slotting).

The spindle is captive by a shoulder, so the valve is assembled by inserting the spindle from inside, then putting in the far O-ring seating, the ball itself turned to the slot engages, the near O-ring then a special circlip that locks into a groove in the valve wall.

A friend in the plumbing-trade vouched for the restriction they offer, but said full-flow versions are available.

It ought be possible to make full-flow versions for much smaller pipe sizes; though rather fiddly to machine. I'd use a manufactured bronze or stainless-steel ball, but I don't have a ball-turning attachment. Besides, it is likely to be of greater accuracy and sphericity than I'd hope to achieve!

To replace the circlip with something easier I'd be tempted to use a thin push-fitted sleeve trapped by the end-fitting or union, but beware the risk of losing the internal components when disconnecting the fitting.

Alternatively look on the boiler-fittings drawings for almost any miniature steam locomotive or traction-engine. The quarter-turn valves on these are usually plug-cocks, but you should find a design you can adapt to your needs.

duncan webster23/06/2019 23:12:18
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2205 forum posts
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Posted by Brian Abbott on 23/06/2019 20:53:12:

Hello.

Does anyone know where i can find a drawings for a miniature quarter turn isolation valve ?

Thanks.

Edited By Brian Abbott on 23/06/2019 20:55:51

I'll send you one tomorrow when I can prise SWMBO off the other computer. you'll have to pm me your email address

Paul Lousick24/06/2019 07:39:04
1151 forum posts
492 photos

Globe valves and ball valves can also be used for controlling steam supply to injectors. If you need a flanged type valve, a commercially available valve could be modified by screwing or silver soldering onto a flange.

Paul.

Brian Abbott24/06/2019 08:18:28
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387 forum posts
63 photos

Thanks guys,

Duncan, will drop you my email address.

Thanks,

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