Everything to Know About Sluice Valves

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Frames, gate valves, screws, nuts, and other items utilized in slurry and abrasive fluid systems make up most of the gate valve construction. A sluice valve is a manually controlled screw-operated gate valve resembling a knife gate valve in shape. To open and close the gate, turn the handle, and the screw will cause the screw nut and gate to reciprocate horizontally. The installation angle is unrestricted, and in addition to being simple to use, you can select a driving system that best suits your requirements, such as electric or pneumatic. Different pipe sizes can be mounted using standard mounting flanges on both sides.

Performance of the Lock

Lift gates or wedges operate the locks, allowing the water to flow freely. The manual wheel or motor that raises and lowers the door is located at the top of the stem. A circular or wedge-shaped gate that prevents water passage is located at the bottom of the stem. Because the valve has a threaded stem, it must be turned several times from the open to the closed position to stop the water hammer.

Installation tips

  • Before installation, ensure the valve chamber and sealing surfaces are clean and grit-free.
  • The flanges’ threaded connections need to be tightened uniformly.
  • The packaging component needs to be pushed to guarantee the package’s tightness and the gate’s flexible opening.
  • Make that the valve type, port size, and medium flow direction fit your needs before installation. Protect the area needed to drive the valve.

Types of the spindle to raise the gate in a sluice valve

  • Lifting Spool Valve: This type of valve has a spool/stem attached to the spool and is known as a lifting spool valve. During use, the spool lifts the valve rather than rotating it with the handwheel.
  • Non-lifting Stem Valve: This valve features an internally threaded spool that attaches to the stem and a threaded stem. The valve stem rotates into place to lift the spool utilizing the screw during operation rather than lifting out of its position.

Maintainance tips

To ensure it is free from clogging and wear if the valve is not frequently used, he should operate and service it once a month. Ahead of time, make sure the system is depressurized and depressurized. The hood and stem need to be removed so the slider can be examined. The locks and guides are then checked for wear and damage, after which the pieces are assembled or replaced.

Usage of sluice gate valves 

Sluice gate valves are frequently employed to restrict fluid flow; they cannot be utilized as flow regulators. Since there is no obstruction in the flow path through the sluice valve, there is negligible flow resistance in the fully open position. The open flow path’s size changes nonlinearly when the spool is moved. This suggests that stem movement is not gradually causing the flow rate to change. A partially open gate may shake in some constructions due to liquid flow. Due to its more straightforward construction than other large valve types, sluice gate valves are frequently employed for pipes with larger dimensions.

Friction can cause problems under high pressure. The medium’s force forces the spool against the guide rail, making it more challenging to operate the valve. When a large gate valve is activated, pressure is frequently reduced by a bypass that is controlled by a smaller valve.

By Michael Caine

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