After years of development, the number of China’s valve enterprises ranked first in the world, the valve production level has also been greatly improved, valve output has increased significantly. At present, domestic valve manufacturers have been able to ISO international standards, Din German standards, Awwa American standards and other international standards design and manufacture of valves, some manufacturers of products even reached the international advanced level. So, how exactly is the valve made? Today let us show you the valve manufacturing process.
Step 1: Body Fabrication
Valve Body (CAST)
Casting procurement (according to standards), in-plant inspection (according to standards), surfacing groove, ultrasonic inspection (according to drawings), surfacing and post-weld heat treatment, finishing, grinding sealing surface, sealing surface hardness testing, coloring inspection.
Step 2: Valve Internals Manufacturing Process
A, Need to build-up welding sealing surface of the internal parts such as a disc, seat, etc.
Raw material purchase (according to standard) inspection (according to standard) manufacture blank (round steel or forgings, according to the technical requirements of drawing) roughing working ultrasonic inspection surface (when the drawing is required) roughing roughing overlaying welding groove roughing overlaying welding and post-welding heat treatment finish machining parts roughing sealing surface hardness inspection, coloring inspection.
B, Valve Stem
Raw Material Procurement (standard) incoming inspection (standard) roughcast (round steel or forgings, according to the requirements of the drawing process) rough surfacing welding groove and post-welding heat treatment finish machining parts surface treatment (nitriding, quenching, chemical plating) final treatment (polishing, grinding, etc.) grinding sealing surface hardness inspection, stain inspection.
C, Do not need to build-up welding sealing surface of the internal parts
Raw material purchasing (according to standard) incoming inspection (according to standard) manufacture blank (round steel or forgings, according to drawing process requirements) roughing ultrasonic inspection surface (when drawing requirements) roughing finishing parts.
Step 3: FASTENER MANUFACTURING
Fastener manufacturing standard DL439-1991.
Raw Material Procurement (standard) incoming inspection (standard) blank (round steel or forgings, as per drawing process requirements) and sampling for necessary inspection.
Step 4: Final Assembly
Get Parts Clean, clean rough assembly (according to the drawing) water pressure test (according to the drawing, process) after passing, open, wipe clean final assembly with electric or actuator debugging (for electric valve) paint packaging shipping.
Step5: Production And Inspction Process
1. Raw Materials of various specifications purchased by the company.
2. Use the spectrum analyzer to test the raw materials and print out the test report of the raw materials and make a backup.
3. Use a cutting machine to cut raw materials. 4. The inspector inspects the cutting diameter and length of raw materials.
5. the forging workshop to raw materials forging molding processing.
6. The inspector inspects the various dimensions of the blank.
7. Workers remove rough edges.
8. A sandpolisher sandblasting a rough surface.
9. The inspector carries out the inspection of the surface treatment after sandblasting.
10. Workers Perform Rough machining.
11. Body seal thread processing-after processing by self-inspection personnel the product is processed and inspected.
12. valve body connection thread processing.
13. Hole drilling.
14. The inspector conducts the General Inspection. Qualified semi-finished goods are sent to semi-finished goods warehouse.
16. electroplating of semi-finished products. Inspection of surface treatment of semi-finished products by electroplating.
18. Inspection of various fittings (ball, stem, sealing seat).
19. Product Assembly in the final assembly shop — The product is inspected by the assembly line inspector.
20. The assembled product is subjected to a pressure test and dried to the next stage.
21. the final assembly workshop on the product packaging-packaging line inspection personnel on the product sealing, appearance, Torque test. Unqualified products are never allowed to be packed. Qualified products are packaged and sent to the finished goods warehouse. All inspection records will be classified and stored in the computer for easy access.
24. Qualified products are shipped in containers at home and abroad.
Post time: Jul-28-2021