Electric actuator straight stroke single seat regulating valve features introduced

Release time:

28 Mar,2024

Straight-through single-seat regulating valve is shown in the figure. Straight-through single-seat regulating valve has a valve core and a valve seat. In the figure, the valve stem is connected with the valve core. When the actuator is displaced in a straight line, the valve core is driven by the valve stem. The upper cover plate is used to compress the packing, and the upper valve cover is connected with the valve body by bolts for the center positioning of the valve stem and the valve core. The valve seat and the upper valve cover are used to ensure the central positioning of the valve core and the valve seat, and when the valve core moves, the flow area of the fluid is changed, thereby changing the manipulated variable and realizing the function of adjusting the fluid flow. The spool guide in the figure adopts the top guide mode. Some straight-through single-seat regulating valves adopt top-bottom guiding mode to improve the guiding degree. Some small flow through control valves often use the valve seat guide way. Straight through single seat control valve only a spool and a valve seat, is a common control valve.

Electric actuator straight stroke single seat regulating valve features introduced
Electric actuator straight stroke single seat regulating valve features introduced

Straight-through single-seat regulating valve is shown in the figure. Straight-through single-seat regulating valve has a valve core and a valve seat. In the figure, the valve stem is connected with the valve core. When the actuator is displaced in a straight line, the valve core is driven by the valve stem. The upper cover plate is used to compress the packing, and the upper valve cover is connected with the valve body by bolts for the center positioning of the valve stem and the valve core. The valve seat and the upper valve cover are used to ensure the central positioning of the valve core and the valve seat, and when the valve core moves, the flow area of the fluid is changed, thereby changing the manipulated variable and realizing the function of adjusting the fluid flow. The spool guide in the figure adopts the top guide mode. Some straight-through single-seat regulating valves adopt top-bottom guiding mode to improve the guiding degree. Some small flow through control valves often use the valve seat guide way. Straight through single seat control valve only a spool and a valve seat, is a common control valve.

Single-seat control valve is characterized as follows:

Leakage is small, easy to achieve strict sealing and cut off, for example, can be used metal to metal hard seal, or metal and PTFE or other composite materials soft seal, the standard leakage of 0.0l%C(C is rated flow coefficient).

The allowable differential pressure is small, for example, the allowable differential pressure of the DNl00 valve is only 120kPa.

The flow capacity is small, for example, the flow capacity of DNl00 straight valve is only 100.

As the fluid medium on the spool thrust, that is, large imbalance, therefore, in high pressure, large diameter applications, should not use this type of control valve.

In recent years, the cage structure of the straight-through control valve because of its maintenance is simple, change the valve seat can change the valve flow characteristics of the advantages of widely used. In order to reduce the spool by the impact of unbalanced forces, can be used large thrust of the actuator, the use of straight-through double-seat valve structure, can also be used to balance the spool of the valve cage structure. A graphite-lubricated sliding piston ring is used between the upper part of the spool and the cage cylinder for sealing between the spool and the cage. The valve cage and the upper valve cover are also sealed by bonnet gaskets and spiral gaskets to ensure that the upstream high-pressure fluid will not enter the downstream low-pressure cavity. In addition, the fluid through the spool top of the balance of the connection hole, while the role of the spool at the bottom and top, eliminating most of the static imbalance force, and has a certain damping effect, reduce the impact of fluid flow caused by vibration and other disturbances.

Keyword:

Control Equipment

Fluid Control

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