Abstract: A gate valve including a valve housing defining a valve chamber having an opening therethrough along a flow path, a gate support supported within the valve housing between a closed position in the flow path, an open position outside of the flow path, and a service position extending out of the valve housing, and a dual actuator assembly having a service piston assembly having a service piston reciprocable within the valve housing, and an inner piston assembly having an inner piston reciprocable within the service piston assembly. The gate support is configured to reciprocate with the inner piston between the closed and open positions, and with the service piston between the closed and the service positions. A method of using the gate valve is also disclosed.

Abstract: A pendulum gate valve includes a housing defining a valve chamber, the valve housing having a vacuum-chamber opening in a front wall and an access opening in a rear wall aligned with the vacuum-chamber opening and defining a through-hole extending from one side of the valve housing to the other side for providing access to the vacuum chamber, a carriage assembly pivotally mounted within the valve housing and moveable between a open position remote from the openings and a closed position between the openings, a valve plate reciprocally mounted on one side of the carriage assembly and movable between an unsealed position spaced from the vacuum-chamber opening and a sealed position sealing the vacuum-chamber opening, a valve-plate actuator carried on the carriage assembly for moving the valve gate between the unsealed and sealed positions, a retractable support reciprocally mounted on another side of the carriage assembly movable between a retracted position spaced from the access opening and an extended positio

Abstract: An apparatus for locking a valve having a valve member movable between an open position and a closed position. The apparatus includes an actuator assembly, a locking base, a locking shaft, and a locking pin. The actuator assembly moves the valve member between the open position and the closed position. The locking base has a through-bore extending from the lower portion to an upper portion, a first thread provided on the upper portion, and a first locking bore extending transversely therethrough. The locking shaft reciprocally extends through the through-bore of the locking base and includes an upper end having a second thread that is selectively engagable with the first thread of the locking base when the valve member is in a predetermined position, and a second locking bore extending transversely through the locking shaft.

Abstract: A clamp for quick release of a generally rectangular bonnet to the flange of valve body is disclosed. The upper side of the edge of the rectangular bonnet is formed with a bevel of about 20 degrees and the lower side of the edge of the body flange is formed with a similar bevel. The clamp consists of semi-circular ends and straight sides hinged together. One side is split and connected by a toggle latch. In cross-section, each clamp section is generally C-shaped, with the top and bottom arms of the C being beveled so that as the clamp sections are drawn inward the bevels wedge the bonnet against the flange. Locating pins fitting into holes in the plate and flange locate the parts and resist implosion when the valve body is subjected to vacuum. To maintain uniform clamping force around the circumference of the bonnet the bevels at the middles of the sides may be less wide than at the ends.