General valve

The filter is a small device for removing a small amount of solids in the liquid, which can protect the normal operation of compressors, pumps, other equipment and instruments. It also improves product purity. Small equipment for purifying gas.

It is widely used in petroleum, chemical industry, chemical fiber, medicine, food and other industries.

It is the size identification of a combination of letters and numbers used for piping system components. It consists of the letter DN followed by a dimensionless integer number.

GB/T: National Recommended Standards
JB/T: Recommended Standards for Machinery Industry
SH: Sinopec Standards
ASTM: American Society for Testing and Materials
ASME: American Society of Mechanical Engineers
ANST: American National Standard
BS: British National Standards

The technological process includes process, installation, station and step; Working procedure refers to a part of the technological process that one (or a group of) workers continuously complete for one or several workpieces on a machine tool (or a fixed work place).

Machining process characteristics of valve body: most of the main machining surfaces are rotary surfaces suitable for turning, such as flanges, inner holes and sealing surfaces. However, the three end flanges have mutual position accuracy requirements, the sealing surface of valve seat has position accuracy requirements, and the guide rib parts need to be machined on the slotting machine or planer; Processing characteristics of valve stem: rotating body parts, with length greater than the diameter, have cylindrical surface and external thread, and have sealing conical surface. There is coaxiality requirement between each cylindrical surface and conical surface; Ram processing features: rotating body parts have sealing surface at the lower end, T-shaped groove at the upper end, and the two sealing surfaces have position reading requirements;

10 degree ramp should be used

Four jaw chuck, seam locking locating disc, inclined tire seam locking locating disc, drilling template, V-shaped locating pressing plate, sleeve mould, single and double angle inclined tire, etc;

The tools required for the valve body of the gate valve are: four jaw chuck, seam locating disc, inclined tire seam locating disc, drilling template, V-shaped locating pressing plate; Tools required for ram: four jaw chuck, single and double angle inclined tire.

If the valve rod is long, tooling and tool holder shall be used