1 product design

(2) mold making

3 valve casting, forging

(1) Sand Casting: valve area of ​​the first production model, because the use of type casting is not enough pressure to cause the production of such a process prone to blisters lead to Gas Valve leakage induced by the product range of issues.

(2) Hot Forging Forging: nine decades of last century

The early Valve Co., Ltd. Ningbo Nanyang first introduced from abroad, the latest forging method, forging using a molding machine to solve the body of trachoma and other related issues to improve the quality of copper valves to a new level.

4 throwing sand

5. Metalworking process

6 parts assembly

7 product pressure test

8 sealed packaging

According to the role and use sub-divided into the following categories of copper valves:

1 brass valve: valve is closed parts (gate) along the channel axis perpendicular to the direction of movement of the valve, the main as a cut in the pipeline medium, which means fully on or off use.

(2) Copper ball valve: evolved from plug valve, it is a sphere hoist pieces, using a sphere around the stem axis of rotation 90 ° to achieve the purpose of opening and closing.

3 copper cut-off valve: refers to the closure of parts (valve) moves along the centerline of the Gas Oven Valve seat. According to this mobile form of valve, valve seat and through the mouth of the change is directly proportional relationship between valve travel.

4 brass check valve: to rely on the flow of the medium itself automatically open and close the valve, backflow valve to prevent cut-off.