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13:02 Dec 6, 2016
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French to English translations [PRO] Tech/Engineering - Mechanics / Mech Engineering / Hydraulics tutorial (300 pages)
French term or phrase:clapet anti-retour de freinage
The symbol is given in the text: it's the normal check valve symbol (wine glass with a tennis ball in it) but the tennis ball is pierced down the centre to show the passage of fluid. I can't find this symbol anywhere.
I've found the term "throttle check valve" which sounds likely. Any hydraulics experts like to comment?
Les **clapets anti-retour de freinage**
Ces clapets sont de clapets anti-retour simple effet.
Ils ont la particularité d’être percés et munis d’un gicleur.
Lorsque le fluide s’écoule de A vers B, le clapet autorise le passage de la totalité du débit.
Dans le sens inverse (de B vers A) un débit limité peut circuler.
Ce type de clapet permet entre autre de contrôler la vitesse à laquelle la tige du vérin rentre dans son alésage.
NB the "equivalent circuit" diagram should not be taken too literally: the bleed path shown at the side need not necessarily be physically at one side. Engineering is full of equivalent circuits that represent physical reality but, more importantly, are amenable to modelling using elementary mathematical constructs.
In addition to the symbol, there's a simple diagram: the check valve with its perforation (throttle) is in its seat; fluid flowing one way pushes it out of its seat, fluid flowing the other way pushes it into its seat. Normally this would close the valve but thanks to the perforation, a small flow is allowed in the other direction.
The diagram is similar to the one here: http://valveproducts.net/check-valve/operation-principle-of-...
except of course for the throttle, which indeed has a "braking" effect on the reverse flow.
Chris, yes, the valve in the diagram in your link with the parallel small bore at the side certainly has the same function.
It does sound like a throttle(d) check valve, though these are frequently represented schematically as a perfect check valve in parallel with a sometimes variable hydraulic shunt: http://www.kanflu.com/assets/PDFs/re275262008-04-Z2FS-16.pdf... Although your particular one has a hole down the middle (the gicleur) its "equivalent circuit" can still be represented as above and its effect is the same.