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              Location:PRODUCTS >> Hydraulic control valve >> Pressure relief, holding pressure valve
              Pressure relief, holding pressure valve
              Model: 500X
              Nominal diameter: DN50 ~ 1000mm
              Nominal pressure: PN1.0 ~ 2.5MPa
              Suitable medium: water, oil, water, sewage
              Temperature: 0 ~ 80 ℃
              Flange Standard: GB / T17241.6, GB / T9113
              Test standards: GB / T13927, API598

              First, 500X relief valve structure and use of features:

              500X pressure relief / pressure holding valve consists of a main valve, pressure relief / pressure pilot valve needle, ball valve, microfilter and pressure gauge to form a hydraulic control takeover system. The use of hydraulic automatic operation, that can be used for pressure relief valve can also be used as holding pressure valve. For pressure relief valve used to maintain the water supply pressure below the set safety value; do holding pressure valve can maintain the main valve upstream of the water pressure above the set value, maintaining the water supply pressure upstream of the main valve. 
               500X pressure relief valve using hydraulic self-control, do not need other devices and energy, easy maintenance, a valve and more. This series of valve products are widely used in high-rise buildings, living areas and other water supply pipe network systems and urban water supply projects.
               

              Second, 500X pressure relief valve works:

              1, as the pressure relief valve: When the pressure relief valve / pressure regulator to adjust the state, the water through the needle valve, the main valve control room, ball valve A, pressure relief / holding pressure pilot valve, ball valve B to export, this time Main valve is open. When the inlet pressure exceeds the safety value set by the pressure relief / pressure holding pilot valve, the pressure relief pilot valve will open automatically and release part of the water through the valve C to relieve the pressure in the pipeline. The pressure relief valve closes automatically when the pressure returns to its safe value. For pressure relief valve, the ball valve normally open. 
               2, as holding pressure valve: When the pressure relief valve / pilot pressure regulator to adjust the state, as long as the main valve inlet pressure below the pilot valve set, pilot valve is closed. The main control room pressure, the main valve is closed. When the pressure on the upstream of the main valve exceeds the set pressure of the pilot valve, the pilot valve can only be opened. The water in the control room is discharged to the outlet via the ball valve. The main valve of the control room is opened and the water supply is started, that is, the upstream hydraulic pressure is maintained. For holding pressure valve, ball valve C is normally closed or replaced with silk plug.
               

              Third, 500X pressure relief valve main technical parameters:

              Nominal pressure (Mpa)

              Shell test pressure (MPa)

              Seal test pressure (MPa)

              Suitable media

              Medium temperature (℃)

              1.0

              1.5

              1.1

              water

              0-80

              1.6

              2.4

              1.76

              2.5

              3.75

              2.75


               Fourth, 500X 
              pressure relief valve main parts and materials:

              Part Name

              Parts and materials

              Body valve cover

              WCB

              Valve seat disc

              Copper alloy

              O-ring seals

              Nitrile rubber

              Valve stem

              2Cr13

              spring

              50CrVA

              Needle valve

              Copper alloy

              Ball valve

              Copper alloy

              Pressure relief / holding pressure pilot valve

              Copper alloy

              Micro filter

              stainless steel

               

              Fifth, 500X pressure relief valve connection size (PN 1.0-2.5MPa):

              Nominal diameter DN

              L

              H

              H1

              A

              B

              50

              250

              335

              90

              170

              170

              65

              280

              345

              98

              180

              180

              80

              310

              355

              110

              190

              190

              100

              350

              365

              120

              200

              200

              125

              400

              445

              145

              215

              215

              150

              450

              460

              155

              230

              230

              200

              550

              505

              190

              255

              255

              250

              650

              550

              250

              295

              295

              300

              800

              710

              290

              325

              325

              350

              900

              725

              330

              380

              380

              400

              1000

              760

              360

              415

              415

              450

              1000

              810

              445

              435

              435

              500

              1100

              865

              495

              460

              460

              600

              1100

              935

              550

              520

              520

              700

              1450

              1000

              605

              570

              570

              800

              1560

              1100

              730

              620

              620

              900

              1800

              1205

              800

              670

              670

              1000

              2000

              1330

              910

              830

              830


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