Patent ID: 6050541
Filing Date: 2000-04-18
Classification: F15B,F16K,Y10T

Abstract:
A pneumatic actuator for a gate valve, said gate valve having an operating stem, said pneumatic actuator comprising:a pneumatic cylinder defining therein a pneumatic chamber, said pneumatic cylinder having first and second ends, said first end defining a plurality of first cylinder end fastener holes therein;a piston reciprocally moveable within said pneumatic cylinder for controlling said operating stem;a spring assembly to bias said piston in a first position;a piston seal for sealing between said piston and said pneumatic cylinder;a first cylinder plate having an edge with a guide ridge profile such that an inner cylinder is formed having an outer diameter that mates to an inner diameter of said first end of said pneumatic cylinder for a slip fit therebetween, said first cylinder plate defining therein a plurality of first plate fastener holes for mating with respective of said plurality of first cylinder end fastener holes;said second end of said pneumatic cylinder defining a plurality of second cylinder end fastener holes therein;a second cylinder plate defining a plurality of second plate fastener holes for mating with said plurality of second cylinder end fastener holes; anda plate seal for sealing between said first cylinder plate and said pneumatic cylinder.