Price of Bellows single seat regulating valve

Bellows Single seat regulating valve is a type of valve that achieves precise flow control and reliable sealing through a bellows sealing structure and a single seat valve core. It is mainly used in situations where strict prevention of medium leakage is required. Its core feature is to use the elastic deformation of the bellows to compensate for the leakage gap during the movement of the valve stem, and to achieve flow regulation through the precise fit between the single seat valve core and valve seat.

Characteristic

Zero leakage seal:

Bellows sealing belongs to metal hard sealing, which can completely block medium leakage through the valve stem and meet strict environmental and safety requirements.

High pressure and high temperature resistance:

Metal corrugated pipes can withstand high pressure and temperature, making them suitable for harsh working conditions.

High adjustment accuracy:

The single seat structure of the valve core is balanced in force, and coupled with a precision guiding mechanism, it can achieve stable flow control.

Corrosion resistance and wear resistance:

Bellows and valve cores can be made of corrosion-resistant materials, and the sealing surface can be welded with hard alloy, suitable for corrosive or high wear media.

The specific workflow of the bellows single seat Regulating valve is as follows:

Execution mechanism driver

Pneumatic or electric actuators receive signals from the control system, generate thrust or torque, and push the valve stem up and down.

Pneumatic actuator: It drives a diaphragm or piston through compressed air and is commonly used in scenarios that require rapid response.

Electric actuator: driven by a motor and gear mechanism, suitable for situations without air source or requiring precise positioning.

Bellows sealing and pressure compensation

Install a metal bellows between the valve stem and valve body, with one end fixed to the valve stem and the other end fixed to the valve body or valve cover.

When the valve stem moves, the bellows stretch or compress accordingly, forming a dynamic seal to prevent medium leakage from the gap between the valve stem and the valve body.

Meanwhile, the bellows can compensate for the impact of medium pressure fluctuations on the actuator, ensuring the positioning accuracy of the valve core.

Flow Control Mechanism

The lower end of the valve stem is connected to the valve core, which forms a throttling section with the valve seat. When the valve stem drives the valve core to move up and down, it changes the flow area and adjusts the fluid flow rate.

Positive valve: Close the valve when the valve core moves downward; Reverse valve: Open the valve when the valve core moves downward.

The flow characteristics are determined by the shape of the valve core and can be selected according to process requirements.