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Check valves meaning of "Retainer less design"

Check valves meaning of "Retainer less design"

Check valves meaning of "Retainer less design"

(OP)
hi to all,

i have a question regarding Chack valves, what means for a check valve the term "retainer less design"?

thanks for all

best regards
Vincenzo Saviello

RE: Check valves meaning of "Retainer less design"

Is this in reference to a ball check?

If so this mean that the ball isn't restrained in its movement, normally lift.  

RE: Check valves meaning of "Retainer less design"

The retainless design means that they do not drill completely through the body of the valve to enable installation of the hinge-pin and stop-pin of a dual-plate check.  Instead of drilling through, they machine out a recess.  This is pretty standard design (retainerless) by most manufacturers.  

See API-594 for some pics of these pins through the body and google retainerless for pics of the variation.  

RE: Check valves meaning of "Retainer less design"

Sorry about leading you astray as I was equating the retainerless description to an ordering description we used on ball checks.  A better comparison probably would have been caged or non-caged.
 
The phrase Fugitive Emissions was just becoming the buzz word and you couldn't run fast enough to give anyone a dual wafer check valve at our site, though we did use a single disk internal hinged check valve.
 

RE: Check valves meaning of "Retainer less design"

(OP)
Hi Bernoullies,

thanks for your explanation. I have found more info about "retainerless" on web. On API 594 valves droawings are all with the retainers passing through the valve body.

Many thanks Vincenzo

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