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SD61HY hydraulic pressure test plug valve

Follow times: Release time: 2014-12-15

Details:

Structure brief

1. The valve adopts butt-welded connection. There is no reduction in the diameter of the straight channel. The single-side flat seal. The valve body sealing surface is stacked with austenitic stainless steel. The plug plate is equipped with an O-shaped rubber seal ring.

2. The middle cavity adopts a pressure self-tight sealing structure. During the hydraulic test or operation, the sealing ring can be pressed by the medium pressure to achieve a reliable seal, and the higher the pressure, the more reliable the seal.

3. The valve body is made of high-quality cast steel, and the two ends are processed into U-shaped grooves and pipes are directly butt-welded. The two materials have similar chemical composition and performance and excellent welding performance, and the intermediate transition section is not required to be welded. Nitriding to ensure its thermal strength, wear resistance, corrosion resistance, scratch resistance, easy assembly and disassembly; self-sealing gaskets in the cavity, corrugated asbestos gaskets for high-temperature steam, and internally woven 18-8 wire reinforcement to ensure sealing Extended service life; surfacing welding of 1Cr18Ni9Ti on the sealing surface, rust prevention, erosion resistance, multiple tests can still ensure the seal.

4. When the valve is shipped from the factory, neither the blocking plate nor the guide bush is installed. Blocking plates and guide sleeves are packaged as accessories and sent to the destination together with the valve.

Structural characteristics of hydraulic test plug valve
1. The valve pressure level is selected according to the design pressure and design temperature.
2. Valves are designed, selected, manufactured, inspected and accepted according to E101, ANSIB16.25JB / T6903, JB / T6440, JB / T6902, JB / T6439, JB / T3595 and other related standards.
3. There are two types of transmission without gear and worm gear (see picture).
4. It adopts pressure self-tight sealing structure and bolted bonnet structure. The branch pipes at both ends are welded.
5. Adopt flat O-ring seal and valve seat made of stainless steel.
6. For the non-transmission mode, the blocking plate is installed during the hydraulic test. After the hydraulic test, the blocking plate can be taken out for multiple hydraulic tests.
7. The sealing of the blocking plate can be adjusted by adjusting the adjusting screw at the top of the support plate to achieve the purpose of sealing.
Installation instructions

1. The valve must be installed and welded in accordance with the flow direction arrow cast on the valve body. The direction of the arrow is the actual working medium flow direction.

2. Before inserting the components of blocking plate 2 and supporting plate 3, check whether the O-ring is intact and fully insert the O-ring into the groove. So as not to fall or not tightly sealed during installation, affecting the seal. And it is guaranteed that the supporting plate 4 has a certain degree of freedom.

3. When inserting the components of the blocking plate 2 and the supporting plate 3, do not unscrew the end face of the supporting plate with the set screw 5, and slowly lower it when hanging in. Do not pinch or hurt the O-ring. And gently press the O-ring against the sealing surface. Fast and forcible installation is strictly prohibited.

4. After the blocking plate 2 and the supporting plate 3 are installed, first tighten the spherical set screws 5 on the upper side of the supporting plate with a wrench to pre-tighten the blocking plate. During the hydraulic pressure test, the blocking plate is compressed by the high pressure water used for its own strength test to achieve seal.

5. After the hydrostatic test is completed, remove the blocking plate and support plate, and put them in the original box together with other accessories for safe storage for the next use.

6. After the equal diameter guide sleeve is installed, the guide plate should be compressed. If necessary, the nut can be spot welded with stainless steel electrodes to prevent loosening.

7. When assembling the bonnet 10 and the support plate 9, the positions of the threaded holes on the support plate should be arranged in the middle of the valve body's main axis or plumb line to facilitate the installation and normal work of the removal plate 8.

Method and steps of disassembly

⑴Install the disassembly plate 8 and fix it on the valve body, so that the support plate 9 can move without shaft;

(Note: there are disassembly boards above DN500)

⑵ Loosen the nuts on the double-headed studs of the support plate, install the spherical set screws 7 and push the valve cover 10 to move downward, so that the four open loops 6 have no pre-tightening force;

(3) Remove the disassembly plate and take out the support plate;

推出 Push out the four open loop through the small hole on the valve body and take it out;

⑸ Screw the bonnet into the eyebolt screw, and gently lift out the bonnet, seal ring, gasket ring and other components, pay attention to protect the seal ring;

Loosen the set screws above the expedition plate, and gently lift out the plugging plate, support plate, support core and other components.

9. After the unit is put into operation and stopped, before restarting, the nuts on the stud bolts on the support plate 9 must be tightened again to ensure the absolute seal of the valve.

SD61HY hydraulic pressure test plug valve is installed on the 300MW boiler superheater outlet, reheater inlet, and outlet steam pipe. It is used as an isolation device when performing the hydraulic test. After the water pressure is removed, the internal plug plate is used as a pipeline. At that time, the blocking plate can be installed again. It adopts pressure self-tight seal structure, and both ends are welded. It is sealed with a flat O-ring, and the valve seat is made of stainless steel. Install the blocking plate during the hydraulic test, and take out the blocking plate after the hydraulic test. The hydraulic test can be performed multiple times. When the valve is installed, it must be installed in the direction of the flow direction on the valve body. The ring should be properly kept.

Model, item

SD61H-64 DN350

SD61H-Pw5420V DN400

SD61H-Pw545V DN650

Performance parameter

Installation position

Reheater inlet

Superheater outlet

Reheater outlet

Design pressure (Mpa) / temperature

4.32 / 350 ℃

20.58 / 546 ℃

5/540 ℃

Hydraulic test pressure (Mpa)

6.6

30.9

6.6

Installation direction

Double flow

Single flow

Double flow

Body material

Carbon steel

alloy steel

alloy steel

structure size

H (mm)

600

880

844

H1 (mm)

285

400

430

L (mm)

1000

1300

1400

L1 (mm)

φ620

φ950

φ1000

D1 (mm)

φ366

φ372

φ635

D2 (mm)

φ410

φ565

φ707

model

caliber
NPS (in)

Main dimensions and connection dimensions (mm)

Weight (kg)

L

d

D

H

SD61HW

16

991

386

432

730

1130

twenty two

1295

500

486

655

1800

SD61HWG

twenty two

1295

500

584

700

1880

34

1753

778

882

1044

4928

SD61HWC9

twenty two

1200

476

570

850

2274

28

1753

608

762

1012

3938

SD61HWC9G

twenty two

1445

476

570

910

2150

28

1753

608

762

1007

4060

SD61HWC9

16

1245

255

405

690

1965

SD61HWC9

twenty two

1499

330

580

970

4500

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First, ① SD61HY hydraulic pressure test plug valve product name and model ② SD61HY hydraulic pressure test plug valve caliber ③ Whether with accessories so that we can choose the correct type for you.

2. If the model has been selected by the design unit, please order directly from our Wein sales department according to the model.

3. When the occasion of use is very important or the environment is more complicated, please provide design drawings and detailed parameters as much as possible, and our valve experts will check and check for you.

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