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Safety Valves for High Temperature and High Pressure Steam

Spring-loaded full-opening safety valves are characterized by simple structure, good sealing performance, accurate opening pressure, large discharge capacity, small differential pressure back to the seat, and easy adjustment.

Nozzle-type seat: The valve seat is a Laval nozzle-type seat, which reaches the speed of sound when the steam flows through the outlet of the valve seat and has a large discharge coefficient, and the sealing surface of the valve seat is overlay welded with foil-pencil lead casting hard alloy, which is abrasion-resistant and erosion-resistant and has a long service life.

Thermo-elastic valve flap: The valve flap is designed as a thermo-elastic structure, utilizing its tiny deformation under medium pressure to improve sealing ability and overcome the front leakage phenomenon of the safety valve when the medium pressure is close to the setting pressure. The sealing surface of the valve flap adopts advanced quenching technology to improve the hardness, abrasion resistance and impact resistance.

Upper adjusting ring: by adjusting the upper adjusting ring, change the direction of flow of the medium discharged from the valve seat, so that the valve to obtain the appropriate seat pressure.

Lower adjusting ring: through the lower adjusting ring, the valve can quickly reach full open when starting and jumping.6. Back pressure adjusting sleeve: the auxiliary structure for adjusting the back pressure of the valve flap, through the adjustment of the back pressure adjusting sleeve, the valve can get the proper back seating pressure difference.

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Safety Valves for High Temperature and High Pressure Steam

Product Overview

Usage

Mainly used in power station boilers, pressure vessels, temperature and pressure reduction devices to ensure the safe operation of equipment.


Installation instructions

1、Safety valve must be installed vertically, and it is best to install it directly on the connector of container or pipeline. The inner diameter of the joint should be not less than the inlet diameter of the safety valve.
2, the outlet of the safety valve must be equipped with appropriate expansion joints to prevent the thermal expansion of the discharge pipe to the safety valve to bring undue thermal stress. Discharge pipe diameter should be larger than the diameter of the valve outlet, the length as short as possible, to avoid bending. The weight of the discharge pipe and the expansion joint should not act on the safety valve and should be fixed on the building. The distance between the center line of the discharge pipe and the center line of the valve body should be as short as possible.
3. The outlet of the muffler should have enough area to prevent back pressure from affecting the discharge capacity of the valve.
4、The degree end of the discharge pipe and the bottom end of the valve body should be equipped with an evacuation pipe; the outlet of the back pressure adjustment sleeve must be equipped with a short bend.

Specifications

Model DN Connection size
L L1 D0 H DN' D' D1' D2' b' Z'-Φd'
A68Y-20 65 210 290 48 923 150 300 250 204 30 8-25
A68Y-P54WV 65 210 290 48 923 150 300 250 204 30 8-25
A68Y-20 80 210 290 52 923 150 300 250 204 30 8-25
A68Y-P54WV 80 210 290 52 923 150 300 250 204 30 8-25
A68Y-25 65 210 290 48 923 150 300 250 204 30 8-25
A68Y-P5414V 65 210 290 48 923 150 300 250 204 30 8-25
A68Y-25 80 210 290 52 1003 150 300 250 204 30 8-25
A68Y-P5414V 80 210 290 52 1003 150 300 250 204 30 8-25
A68Y-32 65 210 290 48 1083 150 300 250 204 30 8-25
A68Y-P5420V 65 210 290 48 1083 150 300 250 204 30 8-25
A68Y-32 80 210 290 52 1083 150 300 250 204 30 8-25
A68Y-P5420V 80 210 290 52 1083 150 300 250 204 30 8-25
A68Y-10 150 310 525 100 1158 300 485 430 390 36 16-30
A68Y-P543.82V 150 310 525 100 1158 300 485 430 390 36 16-30
A68Y-10 200 310 525 125 1158 300 485 430 390 36 16-30
A68Y-P542.5V 200 310 525 125 1158 300 485 430 390 36 16-30
Model DN Connection size
L L1 D0 DN' D' D1' D2' b' Z'-Φd'
A68E210/550V1 65 240 280 46 100 265 210 150 38 8-30
A68SB160/440C1 65 260 280 52 150 320 250 204 30 8-25
A68E210/400C1 80 190 305 58 150 340 280 204 38 8-34
A68E210/550V1 80 190 305 58 150 340 280 204 38 8-25
A68E210/550V2 100 190 305 60 150 300 250 204 30 12-34
A68E160/550V1 100 320 340 70 250 445 385 313 42 8-25
A68SBIOOV1 100 260 325 80 150 300 250 204 30 8-25
A68SBIOOV2 150 260 325 85 150 300 250 204 30 12-34
A68SBIOOC1 150 305 385 115 250 445 385 313 42 12-34
A68SBIOOC2 150 305 385 110 250 445 385 313 42 12-34
A68SBIOOC3 150 305 385 120 250 445 385 313 42 12-34
A68SBIOOV1 150 305 385 115 250 445 385 313 42 12-34
A68SBIOOV2 11/2'(40) 305 385 100 250 445 385 313 42 12-34
A68SC2500C2 2'(50) 155 165 18 Export '3X300Lb
A68SC1500I1 21/2'(65) 216 280 33 Export '6X300Lb
A68SC1500C1 21/2'(65) 216 280 40 Export '6X300Lb
A68C1500C2 21/2'(65) 216 305 46 Export '6X300Lb

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