Valve manufacturing process and inspection process
Usually see gate valve parts are few, simple structure, precision is general, in the machinery manufacturing industry belongs to simple parts, but the pipe sealing position of the gate valve is very high. Valve manufacturing process is complex, the technical level is large, what processing characteristics must be paid attention to? Today we provide the valve manufacturing process and the whole process of inspection!
Production process of gate valve parts
The number of key parts of the gate valve is small, the structure is relatively simple, the processing accuracy of most specifications is not high, and the outside is not smooth, which gives a person an impression of belonging to a simple machine. In fact, the cardiovascular sealing position of the gate valve is very high and precise. The “three degrees “(flatness, smoothness and strength) of the sealing surface is very high, and the fit of the sealing pair composed of the two sealing surfaces needs to be zero to zero, so as to achieve zero leakage of the air tightness test. This kind of non-smooth standard to ensure high precision of the heart part of the zero to zero regulation, is the gate valve production and processing of the very big processing technology problem.
The first step: oil circuit board manufacturing
Gate valve oil circuit plate (cast, surfacing of sealing face)
Purchase of casting parts (according to the specifications)'± incoming inspection (according to the specifications)'± surfacing groove '± Ultrasonic inspection (according to the drawings)'± Surfacing and post-welding heat treatment '± Deep processing ABRASIVE grinding sealing surface (METAL grinding sealing surface) Strength test, color detection test.
Step 2: manufacturing process of gate valve main parts
A. Main parts such as piston valves and high pressure gate valves that need to be surfacing
Raw materials into the factory purchase (according to the specification) '± inspection (according to the specification) '± making blank (steel or steel, as stipulated in the engineering drawings processing technology) '± pretreating ultrasonic surface () stated in the drawings '± pretreating surfacing welding groove '± overlaying welding and heat treatment after welding '± grinding depth processing various '± sealing surface '± sealing surface strength testing, coloring flaw detection.
B, seat
Purchase of raw materials (according to specifications)'± incoming inspection (according to specifications)'± making blank (garden steel or cast steel parts, According to the processing requirements of engineering drawings)'± initial processing surfacing groove '± surfacing and post-welding heat treatment '± Deep processing throughout '± Cutting inner hole '± Surface treatment of valve seat (nitriding, heat treatment, organic chemical coating)'± Final solution (polishing, cutting, etc.) metal milling sealing surface Strength test, color detection detection
C, do not need to surfacing the sealing surface of the main parts
Purchase of raw materials (according to the specifications)'± incoming inspection (according to the specifications)'± Making blanks (garden steel or cast steel parts, according to the processing requirements of the engineering drawings)'± Preliminary processing ultrasonic testing surface (when specified in the drawings)'± Deep processing various places.
Step 3: Standard parts manufacturing
Standard parts manufacturing code DL439-1991.
Purchase of raw materials (according to the specifications)'± incoming inspection (according to the specifications)'± Make blanks (garden steel or cast steel parts, according to the processing requirements of the engineering drawings) and carry out sampling inspection required '± preliminary processing '± in-depth processing Spectrometer inspection.
Step 4: Assembly process
Received parts '± clear, clean '± rough installation (according to the drawing)'± pressure test (according to the engineering drawing, processing technology)'± qualified, disassembled, cleaned '± Final installation TESTER with electric device or electric actuator adjustment (to electric regulating valve)'± paint packaging
Industrial valve manufacturing and inspection steps
1. Raw materials of specifications and models purchased by enterprises.
2. Carry out material inspection of raw materials with spectral analyzer, and print out material inspection report of raw materials to carry out backup data.
3, with blanking machine to carry out laser cutting of raw materials.
4, inspection staff to check the diameter and length of laser cutting raw materials.
5, casting production workshop to carry out casting forming of raw materials.
6, inspection staff to form a variety of blank specifications inspection.
7. The workers are carrying out the removal of blank waste edges.
8. Sandblasting workers carry out the surface sandblasting process for the blank.
9, inspection staff to carry out sandblasting surface treatment inspection.
10, the staff to carry out rough mechanical processing.
11, oil road plate sealing thread processing — the workers in the production and processing since the inspection of the inspection staff after the production and processing of products after the inspection.
12, oil circuit board connection thread processing.
13, hole production and processing.
14. Inspection staff carry out general inspection.
15. Qualified semi-finished products are sent to semi-finished products processing warehouse.
Plating process for semi-finished products processing.
Inspection of surface treatment of electroplating process of semi-finished products processing.
18, all kinds of spare parts (ball, seat, sealing high pressure gate valve) inspection.
19, assembly process production workshop to carry out commodity installation – assembly line inspection staff to carry out equipment inspection.
20, after the installation of the goods through the stability test and drying treatment into the next process.
21, assembly process production workshop to carry out packaging design —- packaging line inspection staff to carry out inspection of equipment airtightness, appearance, torque. Unqualified goods are never allowed to be packed.
22. Qualified equipment is packed in sealed bags and sent to finished goods warehouse.
23. All inspection records will be classified and stored in the computer for inspection anytime and anywhere.
Qualified goods are sent to countries all over the world according to shipping containers.
Post time: May-06-2022
