Pneumatic Diaphragm Single Seat Control Valve
Pneumatic diaphragm control valve uses the compressed air as the power source, the Pneumatic diaphragm as the actuator, and under the help of the valve positioner, converter to drive the valve open or close, to achieve proportional adjustment to the valve opening for controlling the flow, pressure, temperature and other process parameters of the medium.
When the air pressure is input into the air chamber, the film generates thrust force, which makes the thrust disk move to compress the spring to drive the valve stem move downwards or upwards to implement valve action open/close. There is a proportional relation between the valve’s opening and the air source pressure.
Product Description
Valve body structure:
1-Body, 2-Seat, 3-Gasket, 4-Valve plug, 5-Bushing, 6-Gasket, 7-Bonnet, 8-Packing, 9-Packing bushing, 10-Gland, 11-Stem, 12-Hex nut, 13-Stud, 14- Hex nut, 15-Stud
Main technical data:
● Valve body
| Type | Single-seat globe valve |
| Size (DN) | 20, 25, 32, 40, 50, 65, 80, 100, 125, 150, 200 mm |
| Pressure rating | 1.6 MPa, 4.0 MPa, 6.4 MPa / CL150LB, CL300LB, CL600LB, |
| Flange standard | JB/T79.1-94, 79.2-94, ANSI B16.5 |
| Body material | WCB, CF8, CF8M |
| Bonnet structure | Standard type: (-5 ~ 230 ℃), Heat dissipation type:(-45 ~ 230 ℃), Low temperature type:(-196 ~ -45 ℃), Bellow sealed type |
| Bonnet type | Bolted |
| Packing | V-type PTFE / flexible graphite |
| Trim structure | Single-seat / plunger disc |
| Trim material | Seat & Plug: SS304/SS316 surfacing welding Stellite, Shaft: SS304/SS316 |
| Flow characteristic | Equal percentage / Linear |
● Performance
| Flow characteristic | Linear, percentage |
| Allowable range | 50:1 ( CV<6.3 30:1) |
| Rated Cv value | Percentage CV1.6 ~ 630, Linear CV1.8 ~ 690 |
| Leakage grade | Metal seal: IV grade ( 0.01% rated capacity ); Soft seal: VI grade (leakage standard: GB/T 4213) |
| Intrinsic error | ±1.5 % |
| Return difference | ≤1.5 % |
| Dead zone | ≤0.6 % |
| Difference from beginning to end | ±2.5 % |
| Rated travel difference | ≤2.5 % |
| Note: Performance listed base on the packing material in PTFE | |
● Actuator
| Type | Pneumatic diaphragm actuator (multi-spring type) |
| Usage | Regulating, ON-OFF |
| Air supply pressure | Air supply pressure ( Spring range) 140 ( 20 ~ 100) Kpa G 240 ( 40 ~ 200) Kpa G 280 ( 80 ~ 240) Kpa G |
| Input signal | 4-20mA.DC |
| Action to close | pressure increase, valve stem descend, valve close |
| Action to open | pressure increase, valve stem ascend, valve open |
| Lag | ≤1 %FS ( with positioner ) |
| Linear type | ≤2 %FS ( with positioner ) |
| Environmental temperature | -10℃ ～ +70℃ |
| Accessories | E/P, P/P valve positioner, filter regulator, valve converter, solenoid valve, Limited switch. |
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FAQ
Answer : Please send your question or enquiry to our email: sales@hginstrument.com, we will forward the questions to the related engineer.
Answer : Please communicate with the sales about the return procedure before returning product.
Answer : The delivery time depends on the order quantity and product specification. If the product’s specification is conventional ( not special ), delivery time is 5 or 7 working days for order quantity ≤ 10 pieces; delivery time is 2 or 3 working weeks for order quantity 15 ~ 30 pieces.
Answer : by Courier, by Sea or by Air
Answer : Yes, Generally warranty is one year.
Answer : From year 2015 to year 2021, average annual sales is RMB 350 million ( about USD 54.7 million )