NKZ41HVacuum Gate ValveIntroduction:

NKZ41HVacuum gate valves are suitable for operating temperatures ≤425In pipelines with working mediums such as water, steam, or air, used as a shuttering device; especially suitable for power plant steam turbines' condensation and vacuum negative pressure systems, providing vacuum isolation and sealing. The vacuum gate valve is an improvement over the standard manual gate valve, differing in that it has an additional vacuum sealing ring at the packing seal, which has a self-inflating and tightening effect. It offers superior gas sealing performance compared to the standard gate valve.

NKZ41HVacuum Gate ValveStructural Features:

The vacuum gate valve's opening and closing part is a gate plate, which moves perpendicular to the fluid direction. The gate valve can only be fully open or fully closed. , No adjustment or throttling allowed. The gate valve has two sealing surfaces. , Two sealing surfaces of commonly used gate valves form a wedge shape, with the wedge angle varying with valve parameters. , Generally speaking 5°, At low medium temperatures 2°52' The gate of a楔式闸阀 can be made as a single unit, known as a rigid gate plate; or it can be designed to produce a slight amount of deformation. , Enhance its processability , Compensate for the angle deviation in the sealing surface during the processing. , This type of gate is called an elastic gate. The valve is typically installed horizontally.

Vacuum gate valve closed , The sealing surface can be sealed solely by the medium pressure. , The valve relies on the medium pressure to push the sealing surface of the gate plate towards the opposite side of the valve seat to ensure the seal of the sealing surface, which is known as self-sealing. Most gate valves use forced sealing. , When the valve is closed, it must be forced with external force to press the gate plate towards the valve seat. , Ensure the sealing surface maintains its seal integrity.

The valve plate of a vacuum gate valve moves in a straight line along with the valve stem, known as a lift stem gate valve. （ Also known as a clear stem gate valve). Typically mounted on the lifting rod. The trapezoidal thread converts the rotational motion into a linear motion through the nut at the top of the valve and the guide slots on the valve body. , It is to convert the operating torque into operating thrust.

When opening the valve, as the gate rises to a height equal to the valve's bore diameter,1：1The flow channel is fully open at the Beishi point, but this position is unmonitored during operation. In actual use, the top of the valve rod is used as the reference point, i.e., the point where the valve does not move, marking its fully open position. To address the issue of locking due to temperature changes. , Generally, when opened to the topmost position , Revert back 1/2－1Circle , As the position of the full-open valve. , Full open position of the valve, as per the gate position (i.e., stroke)>To confirm.

Some gate valves , The valve rod nut is located on the gate plate, with the handwheel rotation driving the valve rod to turn. , Lift the gate plate , This type of valve is known as a swing stem gate valve or a blind stem gate valve.

NKZ41HVacuum Gate ValveProduct Ordering Instructions:

1.When the user has confirmed the type and model of the valve (especially non-standard models), the user should correctly describe the meaning and requirements of the model.

2.Customers should order based on the product models listed in the sample. If there are special requirements for the product items, please specify them in the order.

1Structural Length2Flange Standard3Valve structure types: such as full bore or reduced bore channels, body cover connection styles4Valve internals and other material requirements5Pressure testing, inspection standards, marking, and other requirements

3When the application of the valve is very critical or the environment is relatively complex.,Please provide design drawings and detailed specifications to the fullest extent, as our experts will review and ensure quality control.

4.Our company can customize electrical equipment according to the specific requirements of our customers.,Pneumatic drive unit,Turbine unit.

5.Our valves, produced by our company, meet all the requirements specified in the order. Each product undergoes rigorous inspections and tests according to the relevant standards before leaving the factory.

6.All Zhongzhi Valve products come with a warranty period: upon customer's formal installation and use.12Within a month or upon product shipment18Within a month.

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