The ZJHW Pneumatic Small Flow Control Valve is a product independently developed by our company for small flow conditions. It consists of a pneumatic diaphragm actuator and a small flow control valve body, featuring a low-height, lightweight, and easy-to-install multi-spring actuating mechanism. The pneumatic small flow control valve is characterized by its compact size, lightweight, high performance, and accuracy in controlling minute flows. When regulating impure media, attention should be paid to the issue of small throttle gaps to prevent clogging. The pneumatic small flow control valve is particularly suitable for primary flow regulation in liquids, steam, and other media.
Pneumatic Low-Flow Control Valve Technical Specifications
| Nominal Diameter (DN) | G3/8"、1/2"、G3/4"、G1" |
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| Valve Seat Diameter (DN) | 1.5 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 15 |
| Rated flow coefficient KV | 0.025 | 0.05 | 0.08 | 0.12 | 0.20 | 0.32 | 0.50 | 0.80 | 1.00 | 1.40 | 1.55 | 1.85 | 2.23 |
| Permitted Pressure Difference (MPa) | Nominal Pressure ≤ |
| Nominal Pressure (MPa) | 1.6、2.5、4.0、6.4、10.0、16.0、25.0、32.0 |
| Actuator Model | ZHA/B-11 |
| Rated Stroke (mm) | 8 | 10 | 12 |
| Valve cover style | Standard Type (-17～+250℃), High Temperature Type (+250～+450℃), Low Temperature Type (-40～-196℃), Bellows Sealed Type (-40～+350℃) |
| Screw Cap Style | Bolt-tensioned |
| Sealed packing material | V-shaped polytetrafluoroethylene packing, V-shaped flexible graphite packing |
| Valve core style | Single-seat |
| Flow characteristics | Percentage level, linearity |
Pneumatic Low-Flow Control Valve, Actuator
| Configuration Actuator Type | ZHA/B Multi-spring Membrane Actuator |
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| Actuator Model | ZHA/B-11 |
| Effective Area (cm²) | 200 |
| Travel Distance (mm) | 10、16 |
| Spring Range (KPa) | 20-100 (standard), 20-60, 60-100, 40-200, 80-240 |
| Diaphragm Material | Nitrile rubber laminated with nylon fabric, Ethylene Propylene rubber laminated with nylon fabric |
| Supply Pressure | 140～400KPa |
| Gas source interface | RC1/4" |
| Ambient Temperature | -30～+70℃ |
| Available accessories | Locators, air filter regulators, holding valves, limit switches, position transmitters, handwheels, etc. |
| Form of Operation | Gas Shut-off (B) - Valve opens (FO) when gas is lost; Gas Open (K) - Valve closes (FC) when gas is lost |
Pneumatic Low-Flow Control Valve - Performance Specifications
| Project | No GPS Tracker | With locator |
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| Basic Error % | ±5.0 | ±1.0 |
| Back-to-back percentage | 3.0 | 1.0 |
| Dead Zone % | 3.0 | 0.4 |
| Always Point Deviation % | Gas valve | Starting Point | ±2.5 | ±1.0 |
| Starting Point | ±5.0 | ±1.0 |
| Air Valve | Origin | ±5.0 | ±1.0 |
| End Point | ±2.5 | ±1.0 |
| Rated travel deviation % | ≤2.5 |
| Leakage Rate L/h | 0.01% of rated capacity |
| Adjustable Range R | 30：1 |
Pneumatic low flow control valve, component material
| Valve body | WCB | 304 | 316 | 316L |
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| Gasket | PTFE Graphite Gaskets | PTFE Graphite Gaskets | PTFE石墨 gaskets | PTFE/Graf Sheet Gasket |
| Valve seat | 304 | 304 | 316 | 316L |
| Valve Core | 304 | 304 | 316 | 316L |
| Valve cover | WCB | 304 | 316 | 316L |
| Valve Stem | 304 | 304 | 316 | 316L |
| Filling Material | PTFE/Graphite | PTFE/Graphite | PTFE/Graphite | PTFE/Graphite |
| Filling Cap | WCB | 304 | 316 | 316L |
Pneumatic Low-Flow Regulating Valve Product Selection
(1) Valve Body Parameters: Nominal Bore Size, Working Pressure, Process Medium, Application, Valve Body Material, and a series of other parameters.
(2) Actuator Parameters: Actuator Type, Control Method, Control Signal (4-20mA, 1-5V), Operation Mode (Air-Open, Air-Shut)
Please provide as detailed technical specifications as possible, which will facilitate our production and technical team in accurately selecting the right product for you. Should you have any questions, feel free to call us, and we will strive to provide you with excellent service!
Related Names: ZJHW Pneumatic Small Flow Regulating Valve, Pneumatic Micro Flow Regulating Valve, Pneumatic Needle Valve
