Our company's ZJHG pneumatic diaphragm regulating valve is composed of a multi-spring pneumatic diaphragm actuator and a regulating valve body, commonly used in chlorine gas media. The pneumatic diaphragm regulating valve features a simple structure, low flow resistance, and greater flow capacity than other valves of the same diameter, with no leakage. It is suitable for regulating high-viscosity and suspended particle fluids. Depending on the diaphragm material (rubber or polytetrafluoroethylene), it is applicable for regulating strong alkalis and highly corrosive media. It is composed of a diaphragm valve paired with a pneumatic diaphragm actuator. The "mountain" shaped convex surface between the diaphragm and valve body provides sealing, isolating from the outside (no stuffing box). The pneumatic diaphragm regulating valve is particularly suitable for environments requiring corrosion resistance and extreme toxicity. The valve employs a modular design, allowing for various combinations and the use of various accessories. Its main features are as follows:
(1) Utilizing a lightweight actuator, both height and weight can be reduced by 30%.
(2) The valve body inner surface features various coated layers to prevent direct contact with the medium and withstand corrosion from strong corrosive substances.
(3) The valve is zero-leakage when closed, both internally and externally, making it particularly suitable for valves handling highly toxic media or those that cannot be contaminated.
(4) Simple flow path, low resistance, rated flow coefficient is higher than that of a single seat, sleeve-type regulating valve of the same diameter.
Pneumatic Diaphragm Regulating Valve - Technical Parameters
| Nominal Pipe Size (NPS) | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 |
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| Valve Seat Diameter (DN) | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 |
| Flow Coefficient | KV | 8 | 12 | 16 | 38 | 60 | 68 | 90 | 150 | 300 | 500 | 600 | 1200 | 1800 |
| Allowable Pressure Difference (MPa) | 1.0 | 0.89 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 0.6 | 0.38 | 0.15 | 0.09 |
| Nominal Pressure (MPa) | 1.6、2.5、4.0、6.4 |
| Rated Stroke (mm) | 10 | 16 | 25 | 40 | 60 | 100 |
| Actuator Model | ZHA/B-22 | ZHA/B-23 | ZHA/B-34 | ZHA/B-45 | / |
| Valve cover type | Standard Type (-17～+250℃) |
| Press-on Cap Style | Bolt-tensioned |
| Sealant Material | V-shaped polytetrafluoroethylene filler, impregnated polytetrafluoroethylene asbestos filler, asbestos textile filler, graphite filler |
| Valve core type | Diaphragm |
| Flow characteristics | Fast-open feature |
Pneumatic Diaphragm Control Valve - Actuator
| Configuration Actuator Type | ZHA/B Multi-Spring Diaphragm Actuator |
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| Actuator Model | ZHA/B-22 | ZHA/B-23 | ZHA/B-34 | ZHA/B-45 | ZHA/B-56 |
| Effective Area (cm²) | 350 | 350 | 560 | 900 | 1400 |
| Travel Distance (mm) | 10、16 | 24 | 40 | 40、60 | 100 |
| 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 Action | Gas Closed (B) - Valve open (FO) when gas is lost; Gas Open (K) - Valve closed (FC) when gas is lost |
Pneumatic Diaphragm Control Valve - Performance Specifications
| Project | Without GPS tracker | Tracker-equipped |
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| Basic Error % | ±5.0 | ±1.0 |
| Difference Return % | 3.0 | 1.0 |
| Dead Zone % | 3.0 | 0.4 |
| Always Point Deviation % | Air Valve | Starting Point | ±2.5 | ±1.0 |
| Origin | ±5.0 | ±1.0 |
| Air Valve | Origin | ±5.0 | ±1.0 |
| End Point | ±2.5 | ±1.0 |
| Rated Stroke Deviation % | ≤2.5 |
| Leakage Rate L/h | 0.01% of rated capacity |
| Adjustable Range: R | 30：1 |
Pneumatic Diaphragm Regulating Valve - Parts Material
| Valve body | HT200, ZG230-450, or the following materials lining |
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| Diaphragm | Dingquan rubber, natural rubber, polytetrafluoroethylene corrugated |
| Film | Nitrile rubber reinforced polyester fabric |
| Spring | 60S12Mn, valve body lining material and application range |
Pneumatic Diaphragm Regulating Valve - Body Lining Material and Application Scenarios
| Valve body liner | Operating Temperature (°C) | Applicable Medium |
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| Unlined | -10～+175 | Suited for non-corrosive media |
| Soft Rubber | -10～+85 | Excellent wear resistance, suitable for cement, clay, coal dust, dry fertilizer, etc. |
| Hard rubber | -10～+85 | Suitable for applications involving no mechanical, salt, hydrochloric acid, plated metal solutions, soft water, chlorides, chlorine gas, etc. |
| Neoprene | -10～+105 | Corrosive mud suitable for animal oil, vegetable oil, and lubricating oil, with a wide range of pH changes, and excellent wear resistance. |
| Ding Quan rubber | -10～+120 | Excellent corrosion and wear resistance, with superior corrosion resistance to most inorganic acids and acidic mortars. |
| Enamelware | -10～+175 | Suitable for inorganic acids, oxidic acids, halogens, alcohols, esters, and other compounds |
| Fluorine 46 | -10～+190 | Suitable for strong corrosive mediums such as sulfuric acid, hydrochloric acid, sodium hydroxide, etc. |
Pneumatic Diaphragm Control Valve - Diaphragm Lining Material & Applications
| Diaphragm Material | Operating Temperature (°C) | Applicable Medium |
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| Dingquan Rubber (Grade B) | -40～+100 | Most inorganic acids such as sulfuric acid, hydrofluoric acid, phosphoric acid, etc., are applicable, with good corrosion resistance, as well as various alkalis and salts. |
| Natural Rubber (Grade Q) | -50～+100 | Primarily used for mineral acid media involving purification of water, inorganic salts, and olefins. |
| Polytetrafluoroethylene | -10～+150 | Excellent chemical stability, resistant to strong acids, alkalis, and corrosion by strong oxidizing agents. |
Pneumatic Diaphragm Control Valve - Product Selection
1. The pneumatic diaphragm regulating valve should be vertically mounted on the pipeline. For those with larger volume and weight or used in vibration conditions, supports and clamps should be added.
2. Pneumatic diaphragm regulating valves should generally be equipped with bypass piping to allow for conversion to bypass operation in the event of a diaphragm failure or maintenance, ensuring the normal progression of the production process. In less critical applications, the bypass piping can be omitted upon installation of a handwheel mechanism for manual operation, and it can also limit the valve opening. When the handwheel mechanism is no longer in use, it should be returned to the original neutral position to facilitate the normal operation of the automatic control system.
3. When cleaning pipes, adjust the valve to a wider opening to facilitate the removal of debris inside the pipe.
4. If the valve body is lined with a corrosion-resistant coating, use a corrosion-resistant soft pad during installation on the pipeline, and ensure that the sealing surface of the valve body flange is not damaged.
5. Regular inspections of diaphragms and linings are required to prevent damage to other parts and accidents due to corrosion and破裂.
ZJHG Pneumatic Diaphragm Regulating Valve, Pneumatic Corrosion-Resistant Regulating Valve
