Valve actuator with pliable pressure conversion device

F - Mech Eng,Light,Heat,Weapons – 16 – K

Patent

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Details

F16K 31/126 (2006.01) F16K 31/12 (2006.01) F16K 31/122 (2006.01)

Patent

CA 2251346

An actuator for fluid control valves with a reversible power module having a stationary inner member (50) and a coaxially aligned movable outer member (48) coupled to the valve flow control element and slidably movable on the inner member. A chamber (90) formed between respective ends of the members includes a preformed bladder (93). Pneumatic pressure applied to the bladder drives the movable member to actuate the valve in a first direction. A spring (112) returns the movable member in the second direction. The preformed bladder is formed with two pieces including an interconnecting perimeter portion (94). During bladder actuation the bladder perimeter portion is displaced from the bladder inner diameter to the bladder outer diameter with the bladder material in tension to thereby prolong bladder life.

Actionneur de vannes de régulation de fluide à bloc réversible de puissance comportant un élément interne fixe (50) et un élément externe mobile (48) aligné sur le même axe relié à l'élément de régulation de fluide et se déplaçant par coulissement par rapport à l'élément interne. Une chambre (90) réalisée entre les extrémités respectives des deux éléments abrite une vessie préformée (93). Une pression pneumatique appliquée à cette vessie entraîne le déplacement de l'élément mobile, qui commande le fonctionnement de la vanne dans un sens. Un ressort (112) renvoit l'élément mobile dans un deuxième sens. La vessie préformée est constituée de deux éléments incluant une section périphérique d'interconnection (94). Lorsque la vessie fonctionne, la section périphérique de celle-ci se déplace du diamètre interne vers le diamètre externe, le matériau constitutif de cette vessie étant soumis à une tension afin de prolonger sa durée d'utilisation.

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