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Plastic Diaphragm Valve(PVC /CPVC /PPH/PVDF)
Size: DN15(1/2″)-DN250（10″)
Standards:GB/T 4219.2/SCH80
Lead time: 30 days around
MOQ: 10ctns
Delivery: Ocean or Express
Port: Ningbo or Shanghai
Place of origin: China
All You Need To Know About Diaphragm Valve
Diaphragm valves are a type of valve widely used in various industries for their ability to handle corrosive, abrasive, and viscous fluids. They are particularly well-suited for applications where contamination must be minimized, making them an excellent choice for industries such as chemical processing, pharmaceuticals, and water treatment.
Structure and Operation
Diaphragm valves consist of a flexible diaphragm that separates the valve body from the flow path. The diaphragm can be made from various materials, including rubber, plastic, or elastomers, depending on the fluid being handled.
How Diaphragm Valves Work
Diaphragm structure: Diaphragm valves usually consist of a valve body, a diaphragm, and a valve stem. The valve body has two fluid passages, one is the inlet passage and the other is the outlet passage, separated by a flexible diaphragm. The stem is attached to the central portion of the diaphragm and can be moved by a manual or automatic control mechanism.
Open state: In the open state of the diaphragm valve, the valve stem is moved upwards, causing the diaphragm to be lifted and fluid can flow from the inlet channel through the diaphragm and into the outlet channel. At this point, fluid can pass freely through the valve.
Closed state: When the diaphragm valve needs to be closed, the valve stem is moved down, pressing the diaphragm against the valve body, preventing further flow of fluid. At this time, the valve stem and diaphragm act as the closing mechanism of the valve, completely sealing the fluid passage.
Control flow: By adjusting the position of the valve stem, the diaphragm can be partially opened or closed to control the flow of fluid. When the valve stem is raised, the fluid flow increases; when the valve stem is lowered, the fluid flow decreases. This makes the diaphragm valve an effective flow control device.
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Names and materials of plastic diaphragm valve components
| NO. | Part Name | Material |
|---|---|---|
| 1 | Cover limit | AS |
| 2 | Stud | Steel，StainlessSteel. |
| 3 | Retaining Nut | FRPP |
| 4 | Washer | FRPP |
| 5 | Wheel | Alloy material |
| 6 | Platen | Steel，StainlessSteel |
| 7 | Double headed stud and Nut | Steel，StainlessSteel |
| 8 | Bonnet | FRPP、PVDF、UPVC、CPVC、PPH |
| 9 | Yoke Nut | Ht300 Steel |
| 10 | Stem | Steel，StainlessSteel |
| 11 | Disc | FRPP、PVDF、UPVC、CPVC、PPH、Steel、StainlessSteel、C.I.FRP |
| 12 | Flim | EPDM、FPM |
| 13 | Diaphragm | F46.PFA |
| 14 | Body | FRPP、PVDF、UPVC、CPVC、PPH |
| 15 | Platen | Steel，StainlessSteel |
Working pressure and temperature gauges for plastic diaphragm valves
| Calibe/MPa/℃ | FRPP | PVDF | UPVC | CPVC | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 14-40 | 41-60 | 61-100 | 40-60 | 61-90 | 91-140 | 20-40 | 41-60 | 61-80 | 0-40 | 41-60 | 61-90 | |
| 15(1/2") | 0.8 | 0.8 | 0.7 | 1 | 0.9 | 0.7 | 0.8 | 0.8 | 0.7 | 0.7 | 0.7 | 0.6 |
| 20(3/4") | 0.8 | 0.8 | 0.7 | 1 | 0.9 | 0.7 | 0.8 | 0.8 | 0.7 | 0.7 | 0.7 | 0.6 |
| 25(1") | 0.8 | 0.8 | 0.7 | 1 | 0.9 | 0.7 | 0.8 | 0.8 | 0.7 | 0.7 | 0.7 | 0.6 |
| 32(11/4") | 0.7 | 0.7 | 0.6 | 1 | 0.9 | 0.7 | 0.7 | 0.7 | 0.6 | 0.7 | 0.7 | 0.6 |
| 40(11/2") | 0.7 | 0.7 | 0.6 | 0.8 | 0.7 | 0.5 | 0.7 | 0.7 | 0.6 | 0.7 | 0.7 | 0.5 |
| 50(2") | 0.7 | 0.7 | 0.6 | 0.8 | 0.6 | 0.5 | 0.7 | 0.7 | 0.6 | 0.7 | 0.7 | 0.5 |
| 65(21/2") | 0.7 | 0.7 | 0.6 | 0.8 | 0.6 | 0.5 | 0.7 | 0.7 | 0.6 | 0.7 | 0.7 | 0.5 |
| 80(3") | 0.7 | 0.7 | 0.6 | 0.7 | 0.5 | 0.4 | 0.7 | 0.7 | 0.6 | 0.7 | 0.7 | 0.5 |
| 100(4") | 0.7 | 0.7 | 0.6 | 0.6 | 0.5 | 0.4 | 0.7 | 0.7 | 0.6 | 0.7 | 0.6 | 0.5 |
| 125(5") | 0.5 | 0.5 | 0.4 | 0.5 | 0.4 | 0.3 | 0.5 | 0.5 | 0.4 | 0.5 | 0.5 | 0.4 |
| 150(6") | 0.5 | 0.5 | 0.4 | 0.5 | 0.3 | 0.2 | 0.5 | 0.5 | 0.4 | 0.5 | 0.4 | 0.3 |
| 200(8") | 0.3 | 0.3 | 0.2 | 0.4 | 0.25 | 0.2 | 0.3 | 0.3 | 0.2 | 0.3 | 0.3 | 0.25 |
| 250 (10") | 0.3 | 0.3 | 0.2 | 0.4 | 0.25 | 0.2 | 0.3 | 0.3 | 0.2 | 0.3 | 0.3 | 0.2 |
What Are Diaphragm Valves Used For?
Diaphragm valve is a special control valve that uses a diaphragm as a power component to achieve fluid control by changing the position of the diaphragm.
1. Wastewater and water
2. Paper and pulp
3. Strength
4. Cement
5. Chemical
6. Minerals and Mining
7. Bioprocessing and Pharmacy
Why Choose Diaphragm Valve?
Advantages of Diaphragm Valves
Diaphragm valves offer several advantages for specific applications:
# Corrosion Resistance: The choice of diaphragm material allows for excellent corrosion resistance, making them suitable for handling aggressive chemicals.
#cContamination Prevention: The diaphragm isolates the fluid from the valve body, minimizing the risk of contamination, which is crucial in the pharmaceutical and food industries.
# Bubble-Tight Seal: Diaphragm valves can achieve a tight seal, even with particulate-laden or viscous fluids.
# Easy Maintenance: They are relatively easy to maintain and repair since the diaphragm is the only component that comes into contact with the fluid.
# Wide Range of Sizes: Diaphragm valves come in various sizes, from small laboratory valves to large industrial units.
Diaphragm Valves Applications
Applications
Diaphragm valves find applications in a range of industries and scenarios, including:
Chemical Processing: Handling corrosive chemicals and acids.
Pharmaceuticals: Ensuring sterility and preventing cross-contamination.
Water and Wastewater Treatment: Managing fluids with suspended solids.
Food and Beverage: Handling viscous or abrasive food products.
Mining: Controlling slurries and abrasive materials.
Considerations for Selecting Diaphragm Valves
Diaphragm Material: Choose the appropriate diaphragm material based on the fluid’s chemical compatibility.
Size and Flow Capacity: Select the valve size that suits your flow rate and pipeline requirements
Actuation: Decide on the type of actuator (manual or automated) based on your control needs.
Maintenance: Ensure ease of maintenance and the availability of spare diaphragms and parts.
Diaphragm valves offer reliable and precise flow control while maintaining the integrity of the handled fluids. Proper selection and maintenance are key to their successful use in industrial processes.
Diaphragm Valve Installation and Maintenance Guide
Installation Guidelines
#1. Before installation Carefully check whether the operating conditions of the pipeline are consistent with the scope of use specified by the valve, and clean the inner cavity to prevent dirt from jamming or damaging the sealing parts.
#2. Do not paint the rubber lining layer and the surface of the rubber diaphragm with oil or grease to prevent the rubber from swelling and affecting the service life of the diaphragm valve.
#3. The hand wheel or transmission mechanism is not allowed to be used for lifting, and collision is strictly prohibited.
#4. When operating the diaphragm valve manually, do not use the auxiliary lever to prevent damage to the driving parts or sealing parts due to excessive torque.
#5. Diaphragm valves should be stored in a dry and ventilated room, and stacking is strictly prohibited. The channels at both ends of the stock diaphragm valve must be sealed, and the opening and closing parts should be in a slightly open state.
Maintenance Guide
#1 Plan Check
Check periodically to determine wear, especially on the diaphragm.
#2 Clean
Clean the valve parts regularly to remove any deposits or buildup.
#3 Diaphragm Replacement
Depending on the type of fluid or gas and operating conditions, plan to replace the diaphragm periodically.
#4 lubricating
Apply an appropriate lubricant to moving parts as specified by the manufacturer.
#5 record-keeping
Keep a maintenance log to track inspection dates, inspection results, and any replacement parts used.
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