1. Valve body

Valve body (casting, sealing surface surfacing) casting procurement (according to standards) – factory inspection (according to standards) – stacking – ultrasonic flaw detection (according to drawings) – surfacing and post-weld heat treatment – finishing – -Grinding sealing surface–Sealing surface hardness inspection, coloring flaw detection.

2. Valve internal parts manufacturing process

A. Internal parts that require surfacing of sealing surfaces such as valve discs, valve seats, etc.
Procurement of raw materials (according to standards)–Incoming factory inspection (according to standards)–Making blanks (round steel or forgings, according to drawing process requirements)–Rough machining of ultrasonic flaw detection surface (when required by the drawing)–Rough machining of cladding groove- – Surfacing and post-weld heat treatment – finishing of various parts – grinding of sealing surface – sealing surface hardness inspection, coloring and flaw detection.
B. Valve stem
Procurement of raw materials (according to standards) – factory inspection (according to standards) – one production blank (round steel or forgings, according to drawing process requirements) – one rough processing surfacing tank – surfacing and post-weld heat treatment – one finishing department –Grinding the outer circle–Valve stem surface treatment (nitriding, quenching, chemical plating)–Final treatment (polishing, grinding, etc.)–Grinding the sealing surface–Sealing surface hardness inspection, coloring flaw detection.
C. Internal parts that do not require surfacing of sealing surfaces, etc.
Procurement of raw materials (according to standards) – factory inspection (according to standards) – production of blanks (round steel or forgings, according to drawing process requirements) – rough processing of ultrasonic flaw detection surfaces (when required by drawings) – finishing of various parts.

3. Fasteners

Fastener manufacturing standard DL439-1991. Procurement of raw materials (according to standards) – factory inspection (according to standards) – production of rough round steel or forgings, according to drawing process requirements) and sampling for necessary inspections – rough machining – finishing – spectrum inspection. Final assembly
Receive the parts – clean and clean – rough assembly (according to the drawing) – hydraulic test (according to the drawing and process) – after passing the test, disassemble and wipe clean – final assembly – debugging with electrical equipment or actuator ( For electric valves) – paint packaging – one shipment.

Product production and inspection process

1. Raw materials of various specifications purchased by the company.
2. Use a spectrum analyzer to conduct material testing on raw materials and print
Prepare raw material test reports for backup.
3. Use a blanking machine to cut raw materials.
4. Inspectors check the cutting diameter and length of raw materials
5. The forging workshop performs forging and forming processing on raw materials.
6. Inspection personnel conduct various dimensional inspections of the blanks during molding.
7. The worker is removing the waste edge of the blank.
8. Sandblasting workers perform surface sandblasting treatment on the damaged hair.
9. Inspectors conduct surface treatment inspection after sand blasting.
10. Workers perform machining of blanks.
11. Valve body sealing thread processing—employees perform self-inspection during processing, and inspectors conduct post-processing inspection of the products.
12. Valve body connection thread processing.
13. Medium hole processing
14. Inspection personnel conduct general inspection.
15. Qualified semi-finished products are sent to the semi-finished product warehouse.
16. Semi-finished products are electroplated.
17. Inspection of electroplating surface treatment of semi-finished products.
18. Inspection of various accessories (ball, valve stem, sealing valve seat).
19. Product assembly is carried out in the final assembly workshop and assembly line inspectors inspect the products.
20. The assembled products undergo pressure testing and drying before entering the next process.
21. In the final assembly workshop, product packaging-packaging line inspectors will inspect the sealing, appearance, and torque of the product. Unqualified products will never be allowed to be packaged.
22. Qualified products are bagged and sent to the finished product warehouse.
23. All inspection records will be classified and stored in the computer for query at any time.
24. Qualified products are sent to domestic and foreign countries through containers