Pneumatic control angle seat valve with small pneumatic control force

Abstract

The invention provides a pneumatic control angle seat valve with small pneumatic control force and relates to the technical field of valves. The pneumatic control angle seat valve comprises a valve body, a valve core, a valve rod and a pneumatic valve control device, wherein the valve core and the valve rod are arranged in the valve body; the pneumatic valve control device is connected with the valve rod; four pneumatic control cavities sealed and isolated from one another are formed in the pneumatic valve control device; the pneumatic control cavities comprise a first pneumatic control cavity, a second pneumatic control cavity, a third pneumatic control cavity and a fourth pneumatic control cavity which are sequentially arranged from top to bottom along an axial direction of the valve rod; the second pneumatic control cavity is communicated with the fourth pneumatic control cavity; a first piston is arranged between the first pneumatic control cavity and the second pneumatic control cavity along the axial direction of the valve rod in a sliding manner; a second piston is arranged between the third pneumatic control cavity and the fourth pneumatic control cavity along the axial direction of the valve rod in a sliding manner; the first piston is fixedly connected with the second piston; the second piston is connected with the valve rod; a reset spring connected with the first piston or the second piston is arranged in the pneumatic valve control device. According to the pneumatic control angle seat valve disclosed by the invention, the top power-assisted pneumatic control part is increased, so that weak valve control force can be realized, and problems existing in the traditional pneumatic control angle seat valve are solved.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to an air-controlled angle seat valve with a smaller air-control force. Background technique [0002] The automatic control valve greatly reduces the manual operation and reduces the production cost; the programmed operation reduces the influence of misoperation caused by human factors. Automatic valves are more and more widely accepted and applied by enterprises. [0003] Nowadays, domestic air control angle seat valve products have been widely used, but there is a common problem that the reverse pressure holding and air control pressure are contradictory, that is, the pressure required for reverse pressure holding is increasing, while the air control part The control force cannot be provided higher, so that the current solution can only use a larger volume cylinder to meet the insufficient air control force, but this will cause the valve to be bulky, resulting in the need to incre...

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Problems solved by technology

[0003] Nowadays, domestic air control angle seat valve products have been widely used, but there is a common problem that the reverse pressure holding and air control pressure are contradictory, that is, the pressure required for reverse pressure holding is increasing, while the air control part The control force cannot be provided higher, so that the current solution can only use a larger volume cylinder to meet the insufficient air control force, but this will cause the valve to be bulky, resulting in the need to increase the equipment space, thus This increases the size of the equipment and increases the cost. In addition, there is also the embarrassing situation of maintenance difficulties and increased maintenance costs caused by the large volume of the valve.

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