Minimum Flow Control Valve

what is a Minimum Flow Control Valve?

ZHD series (Electric/pneumatic)
ZHD minimum flow 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.

Multistage Minimum Flow Control Valve
Multistage Minimum Flow Control Valve Material and internal structure

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.

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 Structures

  • 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.

Body material: carbon steel

1 Seat 25 LF2 F22
2 Nut 25 35 25Cr2Mo1VA
3 Stud 35 40MnB 25Cr2Mo1VA
4 Gasket 316+graphite/PTFE
5 Body 25 LF2 F22
6 Seat 304 304 304
7 Stem 304 304 304
8 Stud 35 40MnB 25Cr2Mo1VA
9 Nut 25 35 25Cr2Mo1VA
10 Gasket 316+graphite/PTFE
11 Packing gasket 304 304 304
12 Stuffing PTFE/Flexible graphite
13 Bonnet 25 LF2 F22
14 Pressing sleeve 304 304 304
15 Gland 25 LF2 F22
16 Nut 35 40MnB 25Cr2Mo1VA
17 Stud 25 35 25Cr2Mo1VA

Body material: stainless steel

1 Sest CF8 CF8M CF3M
2 Nut 304 316 316L
3 Stud 304 316 316L
4 Gasket 316+graphite/PTFE
5 Body CF8 CF8M CF3M
6 Seat 304 316 316L
7 Setm 304 316 316L
8 Stud 304 316 316L
9 Nut 304 316 316L
10 Gasket 316+Graphite/PTFE
11 Stuffing gasket 304 316 316L
12 Stuffing PTFE/Flexible graphite
13 Bonnet CF8 CF8M CF3M
14 Pressing sleeve 304 316 316L
15 Gland CF8 CF8M CF3M
16 Stud 304 316 316L
17 Nut 304 316 316L
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