Novel valve rod
A valve stem, a new type of technology, applied in the direction of lifting valves, valve devices, engine components, etc., can solve the problems of reduced connection keys, high torsional strength, and valve stems that cannot meet the torsional strength
Inactive Publication Date: 2017-02-22
浙江北泽阀门科技有限公司
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0002] The design of the existing valve stem generally cannot meet the requirements of the API standard that the torsional strength of the connection between the shaft and the butterfly plate and all parts within the pressure boundary should be at least 10% greater than the torsional strength of the shaft outside the pressure boundary
If the head size of the valve stem is changed, it is possible to reduce the size of the connecting key, so that the strength of the key cannot meet the driving requirements
Method used
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Embodiment Construction
[0011] Embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
[0012] A new type of valve stem, including a shaft head 1, a shaft tail 2, and a connecting part 3 connecting the shaft head 1 and the shaft tail 2. The length of the connecting part 3 is smaller than the diameter of the connecting part 3. The shaft head 1 butterfly plate The shaft tail 2 is provided with a drive keyway 21 that matches the drive key, the connection between the connecting part 3 and the shaft tail 2 is matched with the packing gland, and the diameter of the shaft head 1 is D1 , the diameter of the shaft tail 2 is D2, the diameter of the connecting part 3 is D3, wherein D3
[0013] The above descript...
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The present invention discloses a novel valve rod, comprising a shaft head, a shaft tail, and a connecting portion connecting the shaft head with the shaft tail. The length of the connecting portion is smaller than the diameter thereof. The shaft head is connected to a butterfly plate. A drive key groove fitting with a drive key is formed in the shaft tail. The joint of the connecting portion and the shaft tail fits with a packing gland. The shaft head has a diameter D1, while the shaft tail has a diameter D2, and the connecting portion has a diameter D3, where D3 is smaller than D1 and also smaller than D2, allowing the diameter of the connecting portion between the drive key and the packing gland to be reduced without changing the existing size d of the shaft head so as to meet the requirement set out in API609.
Description
technical field [0001] The invention relates to the field of valves, more specifically, it relates to a novel valve stem. Background technique [0002] The design of the existing valve stem generally cannot meet the requirements of the API standard that the torsional strength of the connection between the shaft and the butterfly plate and all parts within the pressure boundary should be at least 10% greater than the torsional strength of the shaft outside the pressure boundary. If the head size of the valve stem is changed, it is possible to reduce the size of the connecting key, so that the strength of the key cannot meet the driving requirements. Contents of the invention [0003] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a new type of valve stem, which can make the valve stem comply with the API standard without changing the head size of the valve stem. [0004] To achieve the above object, the present invention pro...
Claims
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Login to View More IPC IPC(8): F16K1/32
CPCF16K1/32
Inventor 邵力亭
Owner 浙江北泽阀门科技有限公司