초록 ▼

A valve actuator is disclosed which is encased in a housing with a bonnet mounted at one end and an end cap on the other end. Inside, an actuator shaft is slidably mounted through a bore on a guide connected to the bonnet. A piston is slidably mounted with respect to the guide and creates a variable

A valve actuator is disclosed which is encased in a housing with a bonnet mounted at one end and an end cap on the other end. Inside, an actuator shaft is slidably mounted through a bore on a guide connected to the bonnet. A piston is slidably mounted with respect to the guide and creates a variable-volume cavity between itself and the guide. The shaft is connected to the piston by virtue of a disk which, when bolted down to the top of the shaft, puts a preload in the spring. A connecting member is placed into contact with the disk and the piston once the spring has been preloaded. The connecting member is segmented and fits between spacers which hold the spring at a distance from the disk and allow insertion of the connecting member after preloading of the spring. The spring bears on the connecting member. Pressurization of the cavity results in an overcoming of the spring force and movement of the shaft between a first and second position. The guide has a liner which is replaceable to effectively change the bore size in the guide, allowing the actuator to accommodate different shafts having a variety of diameters, depending upon the application.

대표청구항 ▼

A valve actuator comprising: a base adapted to be mounted to a valve body; a shaft mounted to said base for reciprocation between a first and second position; biasing means for biasing said shaft into said first position; piston means surrounding said shaft for selectively overcoming said biasing me

A valve actuator comprising: a base adapted to be mounted to a valve body; a shaft mounted to said base for reciprocation between a first and second position; biasing means for biasing said shaft into said first position; piston means surrounding said shaft for selectively overcoming said biasing means for urging said shaft toward said second position; a removable connection means connecting said shaft directly to the outer periphery of said piston means for easy assembly and disassembly; said biasing means being disposed externally of said piston and bearing directly on said connection means at a point adjacent the outer periphery of said piston means.