10 Questions You Should to Know about wcb pinch valve

Pinch Valves are suitable for isolating and controlling abrasive, corrosive, and fibrous materials. The pinch valve is increasingly being utilized as an isolating valve or modulating valve for powder, sludge, dust, emulsions, gaseous materials, granulates, pellets, and other similar substances. Pinch valves are recognized for their exceptional durability, corrosion resistance, and cost efficiency. According to leading valve experts, "Pinch valves are often favored for their simplicity and effectiveness in handling difficult media."

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What Is A Pinch Valve?

A pinch valve is a unique type of valve known for its robust wear and corrosion resistance. It is ideal for controlling the flow of granular slurry or chemical media in low-pressure pipelines. Due to its excellent performance and long service life, the sleeves of the pinch valve can be replaced regularly, reducing costs and offering significant economic benefits to users.

Pinch valves can effectively replace gate valves, ball valves, globe valves, diaphragm valves, slurry valves, and other stainless steel valves. They help lower costs while extending the service life by 5-10 times.

Constructed to withstand acid corrosion both inside and outside, this valve is widely used in pulp, sewage, slag, cinder, sediment, and similar applications. It is capable of quickly controlling the flow volume and shutting off the pipeline.

Based on the different drives for pinch valves, we can categorize three types:

Manual-operated pinch valves are powered by a handwheel.

Air-operated pinch valves are driven by compressed air.

Electric-operated pinch valves are powered by electric power, such as 24V.DC, 220V.AC, or 380V.AC.

What Is A Pinch Valve Used For?

Pinch valves are the ideal choice for transporting solids or liquids containing particles, powder, fiber, slurry, and other abrasive media through pipelines. They are commonly used in wastewater treatment plants, power plants, mining, chemical processes, paper mills, food industry, electronics industry, cement industry, and many other fields.

What Are The Advantages of Pinch Valves?

Pinch valves, also known as squeeze valves, rubber liner valves, rubber tube valves, air sleeve valves, or clamp-off valves, offer several advantages. The quality of the valve is primarily determined by the quality of its rubber sleeve, which can endure corrosion, wear, and pressure. This inner sleeve, squeezed by a pneumatic, electric, manual, or hydraulic actuator, facilitates the switching/regulating function.

The Features of Pinch Valves

• Full diameter, no obstruction of the flow path
• Low flow resistance
• No blocking
• When there are residual particles, the valve can still close with zero leakage
• No gaps and dead zones to ensure smooth valve operation
• Low maintenance cost
• Simple design, unaffected by harsh external environments

Due to their rubber sleeve construction, pinch valves are extensively used in sectors such as smelting, mining, electric power, chemical, food, and brewing. This improves their tightness, corrosion resistance, and wear resistance.

The Main Advantages of the Pinch Valves

1. Scientific Design

Low flow resistance, non-blocking, no gaps, and no dead zone to prevent valve operation, even if the medium contains residual particles. The rubber sleeve can wrap it all and achieve zero leakage when the valve is shut off.

2. Easy to Control

Pinch valves can be controlled on-site or remotely for automated operation, adapting to individual requirements.

3. High Resistance to Wear and Corrosion

Rubber is significantly more wear-resistant than steel, iron, and other metals. Composition adjustments can prevent corrosion from various chemical fluids, making it ideal for managing the transit of granular slurries and chemical media.

4. Excellent Sealing

No extra sealing gasket is required when the valve is coupled to the pipeline. The valve path and the control medium space are completely isolated, ensuring zero internal and external leakage.

5. Excellent Cold Resistance Performance

This prevents fluid crystallization and related problems like shell frost cracking.

6. Simple Installation and Use

The valve can be installed in both directions, eliminating confusion about the flow direction.

7. Quick Maintenance

Pinch valve sleeves can be quickly replaced, ensuring simple maintenance and operation.

8. Long Service Life

THINKTANK’s pinch valve offers a high-quality rubber sleeve with reinforced fabric, withstanding high-frequency opening and closing operations.

9. Low Costs

All sleeve types can be replaced easily without additional tools, resulting in extremely low operation and maintenance costs.

How Does Manual Pinch Valve Work?

Manual pinch valves, known for their reliability in bulk handling and product transport, operate through a mechanical device and handwheel operator. This mechanism activates clamping rods that close and open the valve.

How Does The Pneumatic Pinch Valve Work?

When there is no compressed air input, the fluid pressure tensions the sleeve outward. When the air source enters, the sleeve deforms and intercepts the flow. A differential pressure of 2-3 bars between the air supply and working pressure closes the valve.

THINKTANK Pinch Valves are Useful for a Variety of Reasons

• No dead zones or obstructions in the valve
• 100% tight sealing and shut-off without any leakage, even with solids
• Lightweight design
• Less air consumption due to elliptical body design
• Unmatched service lifetimes
• No mechanical parts, reducing total cost for the end-user
• Reinforced rubber sleeves for abrasive media
• Quick closing times
• Available in stock
• Simple maintenance

What are the Primary Factors Influencing Pinch Valve Quality?

Pinch valves consist of the valve body, sleeve, opening and closing mechanism, and driving device. The sleeves are key to the quality, affected by raw materials, rubber composition, processing technology, sleeve thickness, and uniformity of the wear-resistant anti-corrosion layer.

The following are the 5 reasons for pinch valve quality issues:

1. Insufficient natural rubber and excessive regenerated rubber, leading to significant wear and short service life.
2. Incorrect rubber composition affects wear resistance and chemical resistance.
3. The manufacturing method impacts the sleeve quality; molded rubber sleeves may have uneven thickness.
4. Rust on the valve body or damage to the mechanisms can result in improper valve operation.
5. The quality of pneumatic and electric actuators also affects valve performance.

Pinch valves are ideal for isolating and regulating pipelines containing fluids with solid particles or contaminants. The sleeve, in contact with the medium, is highly resistant to wear and corrosion, making it suitable for complex chemical processes. Applications include power plants, sewage treatment plants, mining, and chemical process control.

Parts of Manual Pinch Valves

• Protective Cover
• Retaining Ring
• Handwheel
• Stem
• Stem Nut
• Centre Bushing
• Upper Body
• Sleeve
• Lower Body
• Nut
• Gasket
• Bracket
• Thrust Bearing
• Upper Guide Bushing
• Bolt
• Upper Pinch Bar
• Side Guide
• Block
• Lower Pinch Bar
• Nut
• Lower Guide Bushing

Specifications

• Body Material: Cast Iron, Cast Steel, Aluminium
• Size: DN25 to DN1000
• Nominal Pressure: PN16
• Valve Type: Straight Through
• Max. Working Pressure: 2.5MPa
• Max. Shutoff Differential Pressure: 0.25MPa
• Full Travel Loading Time(Open to Close): ≤3S
• Effective Diameter: 25 to 1000mm
• Leakage Class: IV. (Refer to standard API598)
• Connection Type: Flange

Dimension of Pinch Valves

Valve Size: PN(Bar)

• 25
• 40-50
• 65-80
• 100-150
• 200-250
• 300-350
• 400-450
• 500-600

Application

Power Plant

• FGD System
• Coal Conveying Device
• Scrubbing System
• Fly Ash Control

Chemical Process Control

• Corrosive and Abrasive Material
• Powder
• Particle
• Waste Treatment

Sewage Treatment Plant

• Sludge Control
• Sand Removal
• Raw Sewage
• Lime, Carbon Slime

Mining Plant

• Tailing Disposal
• Flotation Control
• Multiple Mud Control
• Dredge Pipeline

Which Benefits Will You Get If Buy Pinch Valves From THINKTANK?

▪ High Wear and Corrosion Resistance

Our pinch valves can handle all types of medium concentration acid and arbitrary concentration alkali salt solutions, and these pinch valves can carry pulp, dry and wet powder, and crystalline material medium.

▪ Complete Diameter

When the pinch valve is open, its overall design may be totally integrated with the pipeline system; it won’t modify the pipe’s diameter or structure and has no impact on the pipeline’s flow medium.

▪ Can be Closed with Particles

Because the pinch valves are self-cleaning, any particles that accumulate in the sleeve wall are broken away when the valve is activated. This is attributed to the sleeve’s flexibility, which allows the valve to last longer than many rival products currently on the market.

▪ There is No Leakage.

When the valve is coupled to the pipe, the flow path and control medium space are entirely separated, and there will never be internal and external leakage, therefore eliminating running, risk, drop, leakage, and so on.

▪ Low Maintenance Costs

Pinch valves do not have seats, packing, rings, or telescopic tubes that need to be replaced regularly. Only the sleeve needs to be replaced. The valve will be as good as new when the sleeve is changed.

The solution for isolating, controlling, and metering abrasive, corrosive, and fibrous goods such as granulates, powder, pellets, dust, and liquids containing solids, among others.

Sleeve Materials For Pinch Valves

Various materials are used for sleeves in pinch valves, designed to handle different types of applications and temperatures:

Sleeve Material Suitable TemperatureTypical MediumApplication

• SBRT: -40°C to +110°C, Abrasive materials, diluted acid, alkali, and chemical applications for heavy wearing and high cycle frequency
• EPDM: -40°C to +120°C, Concentrated and oxidizing chemicals for chemical applications
• NBR: -30°C to +100°C, Oils, fats, fuels, hydrocarbon, lubricants for applications involving oils, fats, and hydrocarbon
• NR: -50°C to +75°C, Abrasive materials, diluted acids, alkali, and chemicals for high wear applications
• HNBR: -30°C to +160°C, Oils, fats, fuels hydrocarbon, lubricants for high-temperature applications
• NRF: -40°C to +75°C, Media used in food and other CIP (clean-in-place) processes for foodstuff applications
• NBRF: -30°C to +100°C, Vegetable and animal oils and fats for applications involving fatty foodstuff
• EPDM/B: -40°C to +100°C, Green liquor, alkaline, and extraneous matter in green liquor processes for pulp and paper industry’s green liquor application
• CR: -40°C to +100°C, Chemicals, acids, several solvents, aliphatic oils, fats, lubricants for special-purpose chemical applications
• FPM: -20°C to +120°C, Chemicals, aliphatic oils, aromatic, and halogenated hydrocarbon for special-purpose chemical applications
• CSM: -40°C to +100°C, Chemicals, acids, several solvents, aliphatic oils, fats, lubricants for special-purpose chemical applications
• IIR: -40°C to +100°C, Concentrated and acidic chemicals, vegetable oils for special-purpose chemical applications
• PU: -10°C to +80°C, Abrasive materials, diluted chemicals, hydrocarbon, oils, lubricants for abrasive media applications

Different Flange Types of Pneumatic/Air-Operated Pinch Valves

Different Flanged Ends Types

a. Aluminum Flange

b. Aluminum Flange with Stainless Steel Bushing

c. Aluminum Flange with Internal Threaded

d. Aluminum Flange with Flange Sleeve

Dimensions of Flanged Ends

Dimensions for different flange types include measurements for D1, DA, DF, nB, d, TK, L, G, H, E, and PS Max. (Bar).

Threaded Ends Dimension of Pneumatic/Air-Operated Pinch Valves

Standard options for threaded ends include DIN EN ISO 228 “G” or ANSI/ASME B1.20.1 “NPT” dimensions.

In Conclusion

Now we know the sleeve is the key factor influencing the quality of pinch valves. THINKTANK's pinch valves are used in applications from dirty abrasive industrial slurries and powders to sanitary-grade food and pharmaceuticals ensuring high quality. Please do not hesitate to contact us