As a Wellhead Equipment Manufacturers, share with you. The throttle valve is
a valve that controls the flow of fluid by changing the throttle section or
throttle length. Connect the throttle valve and the one-way valve in parallel to
form a one-way throttle valve. The throttle valve and the one-way throttle valve
are simple flow control valves. In the hydraulic system of a fixed pump, the
throttle valve and the overflow valve can be combined to form three throttle
speed control systems, that is, the oil inlet throttle speed control system
System, oil return line throttle speed control system and bypass throttle speed
control system. The throttle valve has no flow negative feedback function and
cannot compensate for the unstable speed caused by the load change. It is
generally only used for occasions where the load change is not large or the
speed stability is not high.
Choke Valve Wellhead
The performance requirements for the throttle valve are:
·Large flow adjustment range, smooth flow-pressure difference changes;
·The internal leakage is small. If there is an external leakage port, the external leakage should be small;
·The adjustment torque is small and the action is sensitive.
The shape and structure of the Choke valve is no different from that of the globe valve, but the shape of their opening and closing parts is different. The opening and closing parts of the throttle valve are mostly conical streamlined, through which the channel cross-sectional area is changed to adjust the flow and pressure. The throttle valve is used to reduce the medium pressure when the pressure drop is extremely large.
The flow rate of the medium between the throttle valve disc and the valve seat is very large, so that the surface of these parts is quickly damaged, which is the so-called cavitation phenomenon. In order to minimize the impact of cavitation, the valve disc is made of cavitation-resistant materials and made into a streamlined cone with a tip angle of 140-180. This can also enable the valve disc to have a larger opening height. Generally, it is not recommended to section under a small gap flow.
1. The structure is relatively simple, easy to manufacture and maintain, and low cost.
2. The adjustment accuracy is not high and cannot be used for adjustment.
3. The sealing surface is easily eroded and cannot be used as a cutting medium.
4. Poor airtightness.
Choke Valve Wellhead can be divided into straight-through type and angle type according to the channel mode; according to the shape of the opening and closing parts, there are three types of needle, groove and window.
Adjustable throttle valve: the valve needle and valve core are made of hard alloy, and the product is designed according to API6A standard, which has the performance of wear resistance and erosion resistance. Mainly used for wellhead oil (gas) tree equipment.
Sliding sleeve throttle valve: The valve core adopts a low-noise balanced structure, which is easy to open. The product is designed according to API6A standard. The surface of the valve core is covered with tungsten carbide. It is suitable for demanding conditions such as flashing, high pressure difference, high pressure, and cavitation. On occasion, the service life is long, and the flow adjustment accuracy is greatly improved. It is suitable for oil, natural gas, chemical, oil refining, hydropower and other industries.
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