A manual operator a hydraulic operator is connected to move a gate within a gate valve body between a valve open and a valve closed position. The manual operator is used to operate the gate valve when the hydraulic operator is not used. On the other hand, a handwheel for the manual operator can be removed when the hydraulic actuator is used to operate the gate valve.

A hydraulic system includes a circulation pump assembly (2) provided with a speed controller (4, 26), a hydraulic circuit (A, B) connected to the circulation pump assembly (2) as well as a mechanical switch device (86, 88; 120, 122; 120″, 122″) which is subjected to pressure from a fluid in the hydraulic circuit (A, B) and which can be moved into at least two different switch positions. The mechanical switch device (28; 86, 28; 120, 122) can be moved by the circulation pump assembly (2) by way of a hydraulic coupling via the fluid. The speed controller is configured to initiate a movement of the switch device (86, 88; 120, 122; 120″, 122″) by way of at least one hydraulic force acting thereon and causing a movement of the switch device (86, 88; 120,122; 120″, 122″), produced via the hydraulic circuit, via a speed adaptation of the circulation pump assembly.

A hydraulic system includes a circulation pump assembly (2) provided with a speed controller (4, 26), a hydraulic circuit (A, B) connected to the circulation pump assembly (2) as well as a mechanical switch device (86, 88; 120, 122; 120″, 122″) which is subjected to pressure from a fluid in the hydraulic circuit (A, B) and which can be moved into at least two different switch positions. The mechanical switch device (28; 86, 28; 120, 122) can be moved by the circulation pump assembly (2) by way of a hydraulic coupling via the fluid. The speed controller is configured to initiate a movement of the switch device (86, 88; 120, 122; 120″, 122″) by way of at least one hydraulic force acting thereon and causing a movement of the switch device (86, 88; 120,122; 120″, 122″), produced via the hydraulic circuit, via a speed adaptation of the circulation pump assembly.

A hydraulic valve device, in particular an LS directional valve, includes a housing (1), with a pressure supply connection (P), at least one utility connection (A, B), and a load-reporting connection, and includes a controller (5) moveable in two directions to at least partly actuate fluid those connections. An adjustable stop device (25, 31, 47, 59) restricts the stroke length of the travel movements of the controller (5) or parts of the stroke length in either direction. The stop device (25, 31, 47, 59) has a stop surface (25) facing in one movement direction and a second stop surface (47) facing in the other movement direction on the same axial end region (19) of a slider piston (5). A counter stop (31, 59) is provided for each stop surface (25, 47). Both counter stops are on the respective same housing end region (11) of the housing (1) in a positionally adjustable manner.

A hydraulic valve device, in particular an LS directional valve, includes a housing (1), with a pressure supply connection (P), at least one utility connection (A, B), and a load-reporting connection, and includes a controller (5) moveable in two directions to at least partly actuate fluid those connections. An adjustable stop device (25, 31, 47, 59) restricts the stroke length of the travel movements of the controller (5) or parts of the stroke length in either direction. The stop device (25, 31, 47, 59) has a stop surface (25) facing in one movement direction and a second stop surface (47) facing in the other movement direction on the same axial end region (19) of a slider piston (5). A counter stop (31, 59) is provided for each stop surface (25, 47). Both counter stops are on the respective same housing end region (11) of the housing (1) in a positionally adjustable manner.

A valve actuator device includes a supporting body, a driving shaft, and a fluid cylinder having a body connected to one side of the supporting body. The cylinder has a rod that controls rotation of a driving arm rigidly connected to the driving shaft. Linear movement of the rod is converted into rotation of the driving arm by engagement of a cam-follower pin carried by the rod within a slot formed in the driving arm. The slot is formed in an insert that constitutes an element separate from the driving arm body and that is received and held within a seat of the driving arm body. Thus, a single main body for the driving arm provided, having a plurality of inserts for selective mounting within the seat and are differentiated from one another in the dimensions and shape of the slot and/or in the material of the insert.

A valve actuator device includes a supporting body, a driving shaft, and a fluid cylinder having a body connected to one side of the supporting body. The cylinder has a rod that controls rotation of a driving arm rigidly connected to the driving shaft. Linear movement of the rod is converted into rotation of the driving arm by engagement of a cam-follower pin carried by the rod within a slot formed in the driving arm. The slot is formed in an insert that constitutes an element separate from the driving arm body and that is received and held within a seat of the driving arm body. Thus, a single main body for the driving arm provided, having a plurality of inserts for selective mounting within the seat and are differentiated from one another in the dimensions and shape of the slot and/or in the material of the insert.

A butterfly valve assembly includes: a butterfly element configured to control fluid flow through a main conduit; and a butterfly controller configured to control the butterfly element. The controller includes a first chamber for receiving fluid at a first pressure, a second chamber for receiving fluid at a second pressure, and an actuator responsive to the first pressure and the second pressure. The assembly also includes a relief valve arranged to regulate the first pressure in the first chamber within a predetermined pressure range, wherein the relief valve comprises an adjustment mechanism for adjusting the predetermined pressure range. The butterfly valve assembly may comprise a manual override operable to lock the butterfly element in a fully open position or a fully closed position.

An operating structure of a pilot-operated solenoid valve is provided. The pilot-operated solenoid valve includes a valve body having a main valve orifice and a pilot valve orifice to open and close the main valve orifice. The pilot valve orifice communicates with an accommodating chamber of the valve body. The operating structure includes a knob, an adjustment rod, and a water stop nut. The knob is positioned and fitted to an opening of the accommodating chamber. The adjustment rod is hermetically fitted in the accommodating chamber. One end of the adjustment rod is threadedly connected to the knob, and the other end of the adjustment rod is connected to the water stop nut. The adjustment rod is driven to move axially by rotation of the knob for driving the water stop nut to control the opening and closing of the main valve orifice.

An operating structure of a pilot-operated solenoid valve is provided. The pilot-operated solenoid valve includes a valve body having a main valve orifice and a pilot valve orifice to open and close the main valve orifice. The pilot valve orifice communicates with an accommodating chamber of the valve body. The operating structure includes a knob, an adjustment rod, and a water stop nut. The knob is positioned and fitted to an opening of the accommodating chamber. The adjustment rod is hermetically fitted in the accommodating chamber. One end of the adjustment rod is threadedly connected to the knob, and the other end of the adjustment rod is connected to the water stop nut. The adjustment rod is driven to move axially by rotation of the knob for driving the water stop nut to control the opening and closing of the main valve orifice.