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A47Y Flange type spring micro open type safety valve
This valve is suitable for the work temperature are less than 350 of steam, air and other media of the equipment or pipeline, as the overpressure protection device. Connecting flange standard press JB/T-94 Series 1
  • Technical parameter
  • Installation dimensions
  • Model description
  • Working Principle
  • Main parts material

     

    NO.

    Part name

    material

    1

    valve body

    WCB

    2

    valve seat

    ZG2Cr13

    3

    Adjusting ring

    ZG2Cr13

    4

    disc

    2Cr13

    5

    Guide sleeve

    2Cr13

    6

    bonnet

    ZG230-450

    7

    Spring

    50CrVA

    8

    The stem

    2Cr13

    9

    Wrench

    ZG200-400

    10

    stretching screw

    45

    11

    Protective cover

    ZG200-400

    Sealing surface material

    "H" type surfacing D507, "Y" surfacing Co based hard alloy

    Outline dimensions and connection dimensions

    Model

    Size

    DN

    do

    D

    K

    g

    g1

    b

    f

    f1

    Z-φd

    DN'

    D 1

    k1

    g2

    g'

    b1

    f'

    f1'

    Z1- φd1

    L

    L1

    H

    A47H-16C

    20

    15

    105

    75

    55

    16

    2

    4-14

    20

    105

    75

    55

    16

    2

    4-14

    100

    85

    270

    25

    20

    115

    85

    65

    16

    2

    4-14

    25

    115

    85

    65

    16

    2

    4-14

    100

    85

    270

    32

    25

    140

    100

    78

    18

    2

    4-18

    32

    140

    100

    78

    18

    2

    4-18

    115

    100

    312

    40

    32

    150

    110

    85

    18

    3

    4-18

    40

    150

    110

    85

    18

    3

    4-18

    120

    110

    320

    50

    40

    165

    125

    100

    20

    3

    4-18

    50

    165

    125

    100

    20

    3

    4-18

    135

    120

    390

    65

    50

    185

    145

    120

    20

    3

    4-18

    65

    185

    145

    120

    20

    3

    4-18

    140

    130

    395

    80

    65

    200

    160

    135

    20

    3

    8-18

    80

    200

    160

    135

    20

    3

    8-18

    160

    135

    400

    100

    80

    220

    180

    155

    22

    3

    8-18

    100

    220

    180

    155

    22

    3

    8-18

    170

    160

    600

    125

    100

    250

    210

    185

    22

    3

    8-18

    125

    250

    210

    185

    22

    3

    8-18

    190

    190

    620

    150

    125

    285

    240

    210

    24

    3

    8-18

    150

    285

    240

    210

    24

    3

    8-23

    205

    195

    625

    200

    150

    340

    295

    265

    26

    3

    12-23

    200

    340

    295

    265

    26

    3

    12-23

    240

    230

    798

    250

    200

    405

    355

    320

    30

    3

    12-26

    250

    405

    355

    320

    30

    3

    12-26

    350

    320

    981

    300

    250

    460

    410

    375

    30

    4

    12-26

    300

    460

    410

    375

    30

    4

    12-26

    370

    300

    1005

    A47H-25

    20

    15

    105

    75

    55

    16

    2

    4-14

    20

    105

    75

    55

    16

    2

    4-14

    100

    85

    270

    25

    20

    115

    85

    65

    16

    2

    4-14

    25

    115

    85

    65

    16

    2

    4-14

    100

    85

    270

    32

    25

    140

    100

    78

    18

    2

    4-18

    32

    140

    100

    78

    18

    2

    4-18

    115

    100

    312

    40

    32

    150

    110

    85

    18

    3

    4-18

    40

    150

    110

    85

    18

    3

    4-18

    120

    110

    320

    50

    40

    165

    125

    100

    20

    3

    4-18

    50

    165

    125

    100

    20

    3

    4-18

    135

    120

    390

    65

    50

    185

    145

    120

    22

    3

    8-18

    65

    185

    145

    120

    20

    3

    4-18

    140

    130

    395

    80

    65

    200

    160

    135

    24

    3

    8-18

    80

    200

    160

    135

    20

    3

    8-18

    160

    135

    400

    100

    80

    230

    190

    160

    24

    3

    8-23

    100

    220

    180

    155

    20

    3

    8-18

    170

    160

    600

    125

    100

    270

    220

    188

    28

    3

    8-26

    125

    250

    210

    185

    22

    3

    8-18

    190

    190

    620

    150

    125

    300

    250

    218

    30

    3

    8-26

    150

    285

    240

    210

    24

    3

    8-23

    205

    195

    625

    200

    150

    360

    310

    278

    34

    3

    12-26

    200

    340

    295

    265

    26

    3

    12-23

    240

    230

    798

    250

    200

    425

    370

    332

    36

    3

    12-30

    250

    405

    355

    320

    30

    3

    12-26

    350

    320

    981

    300

    250

    485

    430

    390

    40

    4

    16-30

    300

  • Model

     A47Y

    Connection type

     Screw thread

     4

     Flange type

     structural style

     Closed and open type

     2

     Closed full swing

     7

     Non closed with handle micro Rev.

     8

     Not closed with handle full swing type

     Sealing surface material

     F

     PTFE

     Y

     D507

     H

     Cemented carbide

     Size

     DN

     DN15-DN500

     Opening pressure

     Mpa

     xx Mpa

     Material type

     1

     WCB

     2

     CF8

     3

     CF3

     4

     CF8M

     5

     CF3M

     Pressure

     PN10-PN100

     150LB-600LB

     5K-40K

  • The working principle of spring safety valve

    When the pressing force of the steam pressure of safety valve under the flap over the spring, the top valve was opened. Open the top valve, exhaust steam due to the lower ring rebound effect of clamping ring in the valve, the valve opening quickly. Move with the valve, steam impingement in the adjusting ring and the exhaust tends to vertical downward direction, the exhaust steam to generate counterforce to push the valve to and within a certain pressure range enable valve maintained in enough altitude to enhance the safety valve open, steam is continuously discharged, the steam pressure in the system gradually reduce. At this time, will overcome the spring force acting on the valve on the steam pressure and exhaust of the reaction, thereby closing the safety valve.

    The structure characteristics of spring safety valve

    Spring safety valve from the valve and valve seat sealing surface, valve and valve stem connected to the stem of the total displacement of the valve must meet the requirements from the closed to the open. The setting pressure of the safety valve is adjusted by adjusting the bolt to change the spring pressure. The upper part of the valve is provided with a lever mechanism, which is used for manually lifting the valve stem in the action test. The valve body is provided with an upper and a lower two regulating rings, and the lower part of the regulating ring can be adjusted to obtain a complete take-off action of the valve, and the regulating ring is used to adjust the pressure of the back seat. Back seat pressure is too low, the valve remains open for a longer time; back seat pressure is too high, the valve will continue to take off and shut down, resulting in chatter, resulting in damage to the valve, but also reduce the valve discharge. The optimum position of the upper part of the adjusting ring should be able to make the valve reach full stroke.

    Adjust the upper ring and the lower ring

    To the right (counterclockwise) move the adjustment ring (guide sleeve), namely increasing regulation loop to reduce safety valve exhaust volume, improve the safety valve back seat pressure; moves to the left on the adjustment ring, that is, to reduce on the adjustment ring, thereby increasing the safety valve emissions, safety valve back seat pressure decreases. On the adjustment ring to adjust the position of the actual change of steam valve of the reaction. The adjustment ring down, then the steam valve to increase the reaction force of the safety valve is not easy to block, then this can reduce the back seat pressure. The adjustment ring must be adjusted with the adjusting ring (nozzle) of the minor adjustment, in order to make the operation of the safety valve is more reliable, sensitive and correct. To the right (counter clockwise) rotation of the adjusting ring, rising to compete the adjustment ring, the valve opens quickly and is very powerful, emissions while increasing the valve; turn left down link, reduce lower adjustment ring, reduce the discharge amount of steam. If the adjusting ring shift position too low, the valve will open and close in a continuous state