Most of the throttling elements of the choke valve use a needle valve structure; some are cylindrical rubber, and the outer wall of the rubber cylinder is driven by gas and liquid to change the size of its inner hole; some use two overlapping metal plates, relying on their relative rotation. Change the orifice size. Although the flow rate of the fixed throttle of the choke valve is fixed, different displacements can be obtained by replacing the throttle of different sizes according to the needs. The fixed throttle is used in conjunction with the adjustable choke valve. Usually it's recommended to first use the adjustable choke valve, and only use fixed choke when the well kick is large.
The choke valve is very similar to the globe valve in shape and structure, the only difference is the shape and working stroke of the valve disc. Therefore, the components of the choke valve and the globe valve are highly common.
All kinds of shut-off valves can change the cross-sectional area of the medium channel, so they can also play a regulating role to a certain extent, but their regulating performance is not good. This is because their opening and closing parts and the valve stem are movably connected, and there is a gap at the connection, which is inconvenient to adjust; the lifting and lowering of the opening and closing parts is not proportional to the change of the channel area, so it is difficult to achieve accurate and continuous adjustment; when the channel area is When the medium flow rate is small and the medium flow rate is large, it will cause serious erosion of the sealing surface and cause the vibration of the valve disc. Therefore, the choke valve with special structure and the shape of the opening and closing parts is usually used for adjustment.
The choke valve is mainly used to adjust the flow and pressure. When selecting the valve, the flow control range, pressure drop and its load must be considered to avoid premature failure and ensure safe use. Valves used for high differential throttling require specially designed valve sealing elements.
The choke valve can play a role in controlling the fluid flow. Generally speaking, when the pressure difference of the choke valve is constant, the size of the opening affects the change of the liquid flow. In a nutshell, the choke valve has three main functions:
(1) The role of throttling and speed regulation
The choke valve changes the flow by controlling the throttle section or length, which is the main function of the choke valve and its main function.
(2) Play the role of load resistance
The choke valve can also play a load role to a certain extent, which is only a part of the function of the choke valve. The main function of the choke valve is still throttle speed regulation.
(3) The role of pressure buffer
The choke valve can play a pressure buffering effect on the fluid. When the fluid flows in through the choke valve, the choke valve can hinder the operation of the fluid to a certain extent and reduce the impact force.
The working principle and function of the choke valve are introduced here, and I hope it will be helpful for everyone to understand the choke valve. Most of the opening and closing parts of the choke valve are conical streamline, through which the flow and pressure can be adjusted by changing the cross-sectional area of the passage. The choke valve is used to reduce the medium pressure in the case of extremely high pressure drop.
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