What Should Be Done In Checking Valve?

- Sep 02, 2019-

size:

2”-72”

pressure:

7500psi

Material selection:

GS-C251.0619,WCB.WCC,LCB,LCC,LC3,4C,4D,WC6,C5,C12, C12A,CA15CF3,CF8(-196’C),CF3M,CF8M,CF8C,CD4MCu,CK3MC   uN,ZG200-400,ZG230-450,ZG270-500,2G40Cr1,ZG20CrM0.2G15C   r1Mo1V,ZG35Cr1MO.ZG16CrMOG(1Cr5Mo),ZG1Cr13,ZGOCr18Ni9 Ti.5A.KmTB   Cr26.4A

weight:

3Ton

process:

Resin sand casting, etc.

Disintegration

1. Use brushes and cotton yarn to clean the dirt of the valve (before, put the tools and rubber in place)

2. Marking

Use marking pen to draw V-shaped mark at the joint of valve cover and valve body.

3. Remove the blueprint nut

Attention should be paid to the neat arrangement of the nuts and gaskets removed.

4. Loose door cover nut

Take care to loosen it. Dont take it down.

5. Remove the door wheel after opening the door with two buttons

Pay attention to orderly arrangement

6. Button Repair

Triangular file trims burrs on the square part of T-button.

7. Remove the door cap nut, take off the tile pull head and look at the sealing line. Remove the winding pad and put it down.

8. Return the door lever and take out the roots

Cleaning, Inspection, Measurement and Recording

stainless steel Check valve

1. Door pole

After sanding, clean with white cloth. The steel plate ruler measures the curvature of the portal rod (less than 0.2mm), the external diameter of the portal rod, and records it. Stem threads are intact and flexible with threaded sleeve. Smooth surface without rust and wear defects.

2. Sealing part

The sealing surface of the disc and seat shall be free from defects such as cracks, rust and scratches. The sealing line is continuous and uninterrupted, and the contact surface is over 80%.

3. Portal Seat and Door Cover

Clean the inside and outside of the door seat and door cover, and clean the joint with a scraper. There are no defects such as sand holes and cracks in the door seat and cover. The joint of door body and door cover is smooth, and the concave and convex holes are not damaged. The radial clearance should meet the requirements (generally 0.2mm - 0.5mm). Inspection of the valve sleeve, the thread of the door sleeve should be wear-free, deformation-free, non-destructive, well matched with the stem threads, flexible rotation. The threaded connection between the door sleeve and the jacket should be tight and firm, and should not be loosened. Tighten the door seat joint screw. The gasket is in good condition and without defect.

4. Cymbidium and Pangen Chamber

Clean and polish. Especially the paint of embossing orchid. Press orchid intact, rust-free scale; Pangen indoor clean, smooth, defect-free. The threads of bolts and nuts should be intact and properly matched. The gap between the door stem and the platen is 0.20-0.30 mm, and the gap between the platen and the root chamber is 0.30-0.35 mm. The threads of bolts and nuts should be intact and properly matched. If the gap is too large, it should be marked as exceeding the standard.

Records

Butterfly valve

(1) Maintenance records

The surface of the door rod is smooth and free from rust and wear. The T-thread has no wear, no deformation and no damage. It cooperates well with the door sleeve and has flexible rotation. The bending degree of the door stem (standard is less than 0.20 mm): 0.05 mm, which meets the requirements.

2. Sealing part

There are no cracks, rusts and scratches on the sealing surfaces of the tile head and the door seat. The sealing line is continuous and complete without interruption, and the contact surface is over 80%. It meets the requirements.

3. Portal Seat and Door Cover

There are no defects such as sand holes and cracks in the door seat and cover. The interface between the door body and the door cover is smooth, and the concave and convex openings are intact and undamaged. The threads of the door sleeve are wear-free, deformation-free and non-destructive. They fit well with the threads of the valve stem and rotate flexibly. The threads between the door sleeve and the jacket should be tightly and firmly connected without loosening. Radial clearance between concave and convex portal seat and cover (generally 0.2mm - 0.5mm): 0.36mm, which meets the quality standard.

4. Cymbidium and Pangen Chamber

Press orchid intact, rust-free scale; Pangen indoor clean, smooth, defect-free. The threads of bolts and nuts should be intact and properly matched. Gate clearance between door stem and pressure blue (standard 0.20-0.30 mm): 0.36. Not up to the quality standard. The interval between Cymbidium and root canal (standard 0.30-0.35 mm): 0.30. It meets the quality standard.

(2) Checking results

Gate rod and pressure blue gap do not meet the quality standards, the rest are in line with the quality standards.

(3) Indicate the inspector, the recorder and the date

4. Backloading

1. Make a plate.

2. Put the pressure blue on the cover, pierce the door pole, and place the door pole in half position.

3. Place the pad in the recess (lead powder as required).

4. Hang the tile puller, install the door cover according to the mark, tighten the connecting surface screw (check again after the diagonal tightening), and check whether the clearance is even.

5. Close the door and add pans. Staggered 120 degrees, two circles one tight, after adding to see whether the pressure blue and the door pole is vertical.

6. On the door wheel, close the door again and close it.

7. Clean the door surface and seal it. Clean up the scene, clean up the tools