New type of valve stem and valve stem

New valve stem process
Valve stem, English name stem valve, is an important part of the valve parts, for the valve's drive, on the implementation of mechanisms or handle, the following direct drive spool movement or rotation, to achieve the valve switch or regulation.
Valve stem in the valve opening and closing process not only the movement, the force, but also the seal. At the same time, it is subjected to the impact of the media and corrosion, but also with the filler friction. Therefore, when selecting the valve stem material, it must be guaranteed that it has enough strength, good impact toughness, abrasion resistance, corrosion resistance, and so on. The valve stem is wearing parts, the selection should also pay attention to the material processing and heat treatment.
Stem type
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Stem nut and valve stem with a thread, directly under the axial force of the valve stem, and the friction between the plate and bracket. Therefore, stem nut in addition to have a certain strength, also called with the friction coefficient is small, does not rust, and the stem killed performance.
Currently the national valve stem production enterprises of about 200, the valve stem company gradually bigger, increasingly competitive industry.
New type of valve stem processing technology, high thread strength, accuracy, thread parts and optical rod parts of the same thread, overcome the traditional no chip rolling easy distortion, easy deformation, easy to wear, and so on, and easy to open and close, sealing performance is good, and then the key parts of the valve stem down the use of a numerical control, tension, torsion, from many aspects to ensure the quality of products.
A home-made stem cold extrusion forging, thread, high strength, precision, completely solve the original tradition of the valve stem threads spiral knife, screw accuracy are not allowed.
Second threaded part and the rod part of concentricity consistent, overcome the long-standing domestic rolling process silk, with traditional chipless screw rolling easily distorted, easy deformation, wearing roller wire mode of long-standing problem.
Three is the optical rod part uses the patented technology to achieve the mirror effect, opening and closing easy, sealing performance is good, the original light pole position to solve the problem is not high, time-consuming long.
Fourth, pour off parts of the CNC technology, a shape, high precision, emptied the sealing performance is good, can be eradicated original pour off parts of the clamped twice turned down to seal and poor concentricity, seal leakage; end parts of the milling machine the indexing disc indexing, and slow processing of multi process, takes a long time.
Five is the forging process, the end parts of T groove with high efficiency, low cost. Valve stem complete production process has reached the international advanced level.