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Pneumatic double seat globe control valve is an excellent choice for applications involving dirty fluids combined with high-pressure drops. Some typical service conditions and operating requirements include:
- Clean and dirty process fluids
- Moderate to high pressure drops
- Large flow capacities and operating range
- Resistant to process system vibration
- Low emissions and zero leakage options
Pneumatic double seat globe control valve combines excellent high-pressure drop control performance along with the ability to handle dirty fluid applications. The dual port design provides a pressure balanced effect within the valve, which reduces actuator size and thrust requirements.
Dynamic force on plug tends to be balanced as flow tends to open one port and close the other. Reverse-Acting double portedGlobe-Style valve bodies normally have higher capacity than single-ported valves of same line size.
Many double-ported bodies reverse, so the control valve plug can be install as either push down to open or push down to close.
Metal to metal seating of double-seated control valve usually provides only Class II shutoff capability, although Class III capability is also possible.
Port-guided valve plugs of Pneumatic double seat globe control valve are often used for on-off or low-pressure throttling service. Top and bottom guided valve plugs furnish stable operation for severe service conditions.
Pneumatic double seat globe control valve Design Feature
· Strong flow capacity
· Fluid mechanics design idea
· Various trim structure
· Large guiding area for stable movement
· Wide adjustable range and high adjusting precise
· Floating seat with well sealing capability
· Modularized integral structure design for easy inter-changeable
· Apply to control various fluid mediums
Pneumatic control valve Body type: |
straight through casting globe type |
Spool type: | balanced double seated type |
Nominal size: | DN20~200,、 NPS 3/4〞~ 8〞 |
Nominal pressure: | PN16 ~ 100、 CLASS 150LB ~ 600LB |
Connection: flange: | FF、RF、MF、RTJ |
Welding: | SW、BW |
Flange dimension: | According to to IEC 60534 |
Pneumatic double seat globe control valve Bonnet type: | Ⅰ:standard type(-20℃~230℃) Ⅱ:Radiator type: (-45℃~ high than 230℃ occasion) Ⅲ:Low temperature extended type(-196℃~ -45℃) Ⅳ:Bellow seal type Ⅴ:Warm insulation Jacket type |
Packing: | V type PFTE packing, flex. graphite packing, etc. |
Gasket: | Metal graphite packing |
Actuator: | Pneumatic: multi-spring diaphragm actuator, piston type actuator. |
Component name | Control Valve Material |
Body/Bonnet | WCB/WCC/WC6/CF8/CF8M/CF3M |
Valve spool/Seat | 304/316/316L(overlaying stellite alloy) |
Packing | Normal:-196~150℃ is PTFE,RTFE,>230℃ is flexible graphite |
Gasket | Normal:Stainless steel with flexible graphite,Special:Metal tooth type gasket |
Diaphragm Cover | Normal:Q235,Special:304 |
Diaphragm | NBR with reinforced polyester fabric |
Spring | Normal:60Si2Mn,Special:50CrVa |
Control valve stem | 2Cr13/17-4PH/304/316/316L |
Pneumatic double seat globe control valve Flow characteristic | Linear, percentage, quick open | |
Allowable range | 50: 1 | |
Rated Cv value | Percentage CV10~1400 ,linear CV11~1500 | |
Pneumatic double seat globe control valve Allowable leakage |
Metal seal:Ⅱgrade(0.5% rated capacity) Soft seal: V grade Leakage standard: GB/T 4213 |
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Pneumatic double seat globe control valve Performance | ||
Intrinsic error (%) | ±1.0 | |
Return difference(%) | ≤1.0 | |
Dead zone(%) | ≤1.0 | |
Difference from beginning to end point(%) | ±2.5 | |
Rated travel difference(%) | ≤2.5 |
Special test | Material penetration flaw detection (PT), radiator test (RT), flow characteristic test, low temperature test. |
Special treatment | Trim nitrogen treatment, seat hard alloy treatment. |
Special rinse | Degreasing and dehydration treatment |
Special condition | Special piping or connection, vacuum condition, S.S fastener, special coating. |
Special dimension | Customized face to face length or dimension |
Test and inspection | Third party test report |
Pneumatic control valve Type\ Method |
Pneumatic diaphragm actuator |
ZH23~ZH56 | |
Multi-spring type | |
Usage | Regulating type, ON-OFF type |
Air supply pressure or Power supply voltage | Air supply pressure (Spring range) 140(20~100)Kpa G 240 (40~200) Kpa G 280 (80~240) Kpa G |
Connector | Air pipe connector: RC1/4 |
Direct action | Pressure increase, stem descend, valve close. |
Reaction | Pressure increase, stem ascend, valve open. |
Input signal | 40~20mA.DC(with positioner) |
Lag | ≤1%FS(with positioner) |
Linear type | 2%FS(with positioner) |
Environmental temperature | -10℃~+70℃ |
Pneumatic double seat globe control valve Accessories |
E/P, P/P valve positioner, filter regulator, valve converter, solenoid valve, limited switch Non-standard accessories, need special customized notes. |
Seat diameter(mm) | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | ||
Rated Cv | Percentage | 10 | 16 | 25 | 40 | 63 | 100 | 160 | 250 | 400 | 630 | 1000 | 1400 | |
Linear | 11 | 17.6 | 27.5 | 44 | 69 | 110 | 176 | 275 | 440 | 690 | 1100 | 1500 | ||
Nominal size | Travel | Option flow coefficient, Cv(★standard ●recommended ○customized) | ||||||||||||
DN25 | 16 mm | ★ | ||||||||||||
DN32 | 25 mm | ○ | ★ | |||||||||||
DN40 | ○ | ● | ★ | |||||||||||
DN50 | ○ | ● | ● | ★ | ||||||||||
DN65 | 40mm | ○ | ○ | ○ | ★ | |||||||||
DN80 | ○ | ○ | ○ | ● | ★ | |||||||||
DN100 | ○ | ○ | ○ | ● | ● | ★ | ||||||||
DN125 | 60mm | ○ | ○ | ○ | ★ | |||||||||
DN150 | ○ | ○ | ● | ★ | ||||||||||
DN200 | ○ | ○ | ● | ● | ★ | |||||||||
DN250 | 100mm | ○ | ● | ● | ★ | |||||||||
DN300 | ○ | ● | ● | ★ | ||||||||||
Pneumatic actuator,Diaphragm effective area, Ae (cm2) | ZHA/B-23 | ZHA/B-34 | ZHA/B-45 | ZHA/B-56 | ||||||||||
350 | 560 | 900 | 1600 | |||||||||||
Action | Spring range | Pneumatic double seat globe control valve Metal seal allowable pressure difference(MPa) |
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Air to open | 20-100KPa | 3 | 2.25 | 2.25 | 1.95 | 2.36 | 2.04 | 1.67 | 1.41 | 1.41 | 1.14 | 0.65 | 0.55 | |
40-200 KPa | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 1.55 | 1.4 | ||
80-240 KPa | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 4.08 | 4.08 | ||
Air to close | 20-100KPa | 1.5 | 1.13 | 1.13 | 0.98 | 1.18 | 1.02 | 0.84 | 0.71 | 0.71 | 0.57 | 0.65 | 0.55 | |
40-200 KPa | 4.5 | 3.38 | 3.38 | 2.93 | 3.54 | 3.06 | 2.51 | 2.12 | 2.12 | 1.71 | 1.8 | 1.55 | ||
80-240 KPa | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 5.85 | 4.94 | 4.94 | 4 | 4.08 | 3.65 |