Multistage Minimum Flow Control Valve

What is minimum flow control valve? How does an minimum flow control valve work?

Minimum Flow Control Valve Introduction

ZHD series (Electric/pneumatic)
ZHD multistage cage control valve used a multilevel cage symmetric sleeve control valve. It complete control medium velocity within the valve, and greatly reduced noise made by high-pressure gas or steam within the valve, stabile multistage pressure reducing effective prevent liquid cavitation, so it’s the stable control valve used in high-pressure medium performance, customers can also select multi-spring diaphragm mechanism or pneumatic actuators, etc.

Tehnical parameters

Body type:Direct casting ball-type valve
Nominal diameter:DN20, 25, 32, 40, 50, 65, 80, 100, 200
Nominal pressure:PN 1.6, 2.5, 4.0, 6.4, 10.0, 16、25Mpa
CLASS 150, 300, 600, 900、1500Lb
Connectionflange: FF, RF, RTJ, etc,
welding: SW, BW
Flange distance:according to IEC534
Bonnet type:stdanrd type, lengthened (heat dissipation, low temperature, bellows sealing).
Packing:V type PTFE, flexible graphite, etc.
Sealing gasket:Metal with graphite gaskets
Actuator:Pneumatic, multi-spring actuator.
Electric: 3810L series, PSL series.
Valve disc type:multistage cage sleeve type.
Flow characteristics:equal percentage, linear.
Disc material:standard material composition and applicable temperature, pressure range, please refer to appendix.
Multistage Minimum Flow Control Valve
Multistage Minimum Flow Control Valve

Model selection

ZR:3810L seriesH:Linear actuatorD: multistage cage sleeve type-16:
PN1.6Mpa
C:Carbon steel DN 20
Size:20mm
P: PSL seriesP: Chromium-Nickel- titanium Steel 
J:Pneumatic diaphragm-150LB:
CL 150LB
I: Chromium-molybdenum steel-B:Air to closeIN 1〞
Size: 1〞
H: Linear cylinderV: Chromium-molybdenum-vanadium steel-K:Ai r to open

Customized selection

BodyTypeDirectBonnetModelStandard, lengthened
MaterialWCB, WC9, 304, 316,etc.MterialWCB, WC9, 304, 316,etc.
DiscCharacteristicLinear, equal percentage, quick openingPackingV type PTFE
Flexible graphite, bellow sealing
Material304, 304+STL/PTFE, 316, 316+STL/PTFE
ActuatorPneumatic: See appendix6
Electric: See appendix6
PositionerElectric valve positioner, intelligent digital positioner
AccessoriesSolenoid valve, valve position feedback device, hand-operated the mechanism, lock-up valve, air filter pressure relief device, etc.

Material and internal structure

Body material: carbon steel

1Seat25LF2F22
2Nut253525Cr2Mo1VA
3Stud3540MnB25Cr2Mo1VA
4Gasket316+graphite/PTFE
5Body25LF2F22
6Seat304304304
7Stem304304304
8Stud3540MnB25Cr2Mo1VA
9Nut253525Cr2Mo1VA
10Gasket316+graphite/PTFE
11Packing gasket304304304
12StuffingPTFE/Flexible graphite
13Bonnet25LF2F22
14Pressing sleeve304304304
15Gland25LF2F22
16Nut3540MnB25Cr2Mo1VA
17Stud253525Cr2Mo1VA

Body material: stainless steel

1SestCF8CF8MCF3M
2Nut304316316L
3Stud304316316L
4Gasket316+graphite/PTFE
5BodyCF8CF8MCF3M
6Seat304316316L
7Setm304316316L
8Stud304316316L
9Nut304316316L
10Gasket316+Graphite/PTFE
11Stuffing gasket304316316L
12StuffingPTFE/Flexible graphite
13BonnetCF8CF8MCF3M
14Pressing sleeve304316316L
15GlandCF8CF8MCF3M
16Stud304316316L
17Nut304316316L
Multistage Minimum Flow Control Valve Material and internal structure

Note

  • The above is standard configuration structure, the valve seat is metal to metal, and we can still provide strengthed trim with stellite alloy coating. For specific applicable temperature, we have more reasonable bolts, nuts for choose.
  • PTFE v-shaped ring stem packing is the standard configuration and can also choose flexible graphite.
  • Standard body material is carbon steel and stainless steel, and we can still provide various high corrosive-resistance alloy materials.

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