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.
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 |
| Connection | flange: 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
| Z | R：3810L series | H：Linear actuator | D: multistage cage sleeve type | -16： PN1.6Mpa | C：Carbon steel | DN 20 Size:20mm | |
|---|---|---|---|---|---|---|---|
| P： PSL series | P： Chromium-Nickel- titanium Steel | ||||||
| J：Pneumatic diaphragm | -150LB： CL 150LB | I： Chromium-molybdenum steel | -B：Air to close | IN 1〞 Size: 1〞 | |||
| H: Linear cylinder | V： Chromium-molybdenum-vanadium steel | -K：Ai r to open |
Customized selection
| Body | Type | Direct | Bonnet | Model | Standard, lengthened |
|---|---|---|---|---|---|
| Material | WCB, WC9, 304, 316,etc. | Mterial | WCB, WC9, 304, 316,etc. | ||
| Disc | Characteristic | Linear, equal percentage, quick opening | Packing | V type PTFE Flexible graphite, bellow sealing | |
| Material | 304, 304+STL/PTFE, 316, 316+STL/PTFE | ||||
| Actuator | Pneumatic: See appendix6 | ||||
| Electric: See appendix6 | |||||
| Positioner | Electric valve positioner, intelligent digital positioner | ||||
| Accessories | Solenoid valve, valve position feedback device, hand-operated the mechanism, lock-up valve, air filter pressure relief device, etc. | ||||
material and internal structures
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.
| 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 |
| 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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