Valve stem, English name valve stem, is an important part of valve accessories. It is used for valve transmission, connected to the actuator or handle, and directly drives the valve core to move or rotate below to realize valve switching or adjustment.

The valve stem is not only a moving part, a force-bearing part, but also a sealing part during the valve opening and closing process. At the same time, it is impacted and corroded by the medium, and it also produces friction with the filler. Therefore, when selecting the valve stem material, it must be ensured that it has sufficient strength, good impact toughness, scratch resistance and corrosion resistance at the specified temperature. The valve stem is a wearing part, and attention should also be paid to the machinability and heat treatment performance of the material when selecting it.

Stem type

Stem types are: globe valve stem, gate valve stem series, ball valve stem, butterfly valve stem, forged steel valve stem, soft sealing stem, stainless steel stem series, large stem and a series of valve stems.

The valve stem nut is matched with the valve stem by thread, which directly bears the axial force of the valve stem, and the friction between the card and the valve parts such as the bracket is involved. Therefore, in addition to a certain strength, the valve stem nut is also required to have a small friction coefficient, no rust, and no seizure with the valve stem.

The new valve stem processing technology adopts self-made forging cold extrusion forming technology, which has high thread strength, accurate precision, and the same concentricity between the thread part and the polished rod part, which overcomes the problems of traditional chipless rolling, such as easy distortion, easy deformation, and easy damage to the rolling die. , the polished rod part adopts the technology to achieve the mirror effect, and the opening and closing is easier, and the sealing performance is good, and the key part of the valve stem is closed by CNC one-time forming, which is tensile and torsion-resistant, which ensures the quality of the product parts from many aspects. .

First, the valve stem is formed by self-forging and cold extrusion, with high thread strength and accurate precision, which completely solves the original traditional valve stem thread using a spiral flying knife, and the thread accuracy is not accurate.

The second is that the concentricity of the thread part and the polished rod part is consistent, which overcomes the long-standing problems that have long plagued the domestic thread rolling process.

The third is that the polished rod part adopts technical precision to achieve the mirror effect, which is easy to open and close, and has good sealing performance, which solves the problem of low precision and long time consumption of the original polished rod part grinder.

Fourth, the inverted part is formed by CNC technology at one time, with high precision and good inverted light sealing performance. Dial indexing, and slow processing, many processes and time-consuming problems.

Fifth, the T-slot at the end adopts the forging forming process, which has high efficiency and low cost. The whole production process of the valve stem has reached the international advanced level.

This new process not only has low processing cost of the valve stem and screw, but also ensures the quality of product parts and reduces the cost of the product; and the valve stem and screw are assembled in the valve, so that the valve opening and closing torque is small, and the opening and closing is easy and convenient. Labor and time saving; smooth surface, good coaxiality, high sealing performance; anti-position, anti-torsion, high strength, and enhanced valve service life and many other advantages.