What is the manufacturing process of the valve stem?

There should be an anti-static mechanism at the joint between the valve stem and the ball and the contact between the valve stem and the valve body to prevent static electricity from accumulating on the ball. The safety design of the valve stem should prevent it from being "blown out" under the working pressure, and the blowout-proof flange on the valve stem is equipped with an annular ring to reduce the friction coefficient. Therefore, the manufacturing process requirements of the valve stem are very high.

Characteristics of traditional valve stem technology

1. The traditional valve stem thread adopts spiral flying knife, and the thread accuracy is not accurate; while the traditional chipless rolling die is easy to be damaged, and it is easy to deform and twist.

2. The precision of the grinding machine used for the polished rod is not high, and it takes a long time.

3. Twice clamping is used to turn around and pull down the seal at the inverted closing position, the concentricity is poor, and the inverted seal is easy to leak.

4. The end part adopts the indexing plate of the milling machine, the processing is slow, the process is many, and it takes a long time.

The characteristics of the valve stem manufacturing process:

1. The thread of the new valve stem adopts self-made extrusion, which has high thread strength and accurate precision.

2. The concentricity of the threaded part and the polished rod part overcomes the long-term problem of easy twisting and damage of the thread rolling die in the domestic thread rolling process.

3. The precision of the polished rod reaches the mirror effect, easy to open and close, and good sealing.

4. The inverted part adopts numerical control technology to form at one time, with high precision and good inverted sealing performance.

5. The T-shaped groove at the end part adopts forging and pressing forming process, which has high efficiency and low cost.