Pinch Valves Manufacturers

Our Pinch Valve Range

We manufacture the complete FNC® family in one facility, from standard closed-body units to large-diameter valves and open-body designs for low-pressure service. Each body style shares the same full-bore sleeve principle, so the selection decision usually comes down to line pressure, temperature, available face-to-face space and how often the valve will be serviced.

Where Pinch Valves Fit in the Process

Pinch valves are chosen where the medium would destroy a metal seat: sharp solids, fibrous pulp, crystallizing slurries, lime milk, tailings, ash and aggressive chemical solutions. Because the sleeve deforms around particles instead of sliding against them, wear is distributed across the elastomer rather than concentrated at a seat edge.

• Mining and mineral processing: cyclone feed, tailings return, thickener underflow, flotation and backfill lines.
• Wastewater and sewage: raw sludge, grit and lime dosing where blockage-free shut-off matters more than tight metal-to-metal sealing.
• Chemical processing: acid, alkali and salt solutions handled with EPDM or NBR sleeves and isolated metal bodies.
• Power generation: FGD limestone slurry, ash handling and bottom-ash recirculation.
• Pulp and paper: high-consistency stock and coating circuits where fiber would foul a ball or gate valve.

For lines that need a hard-faced, sliding isolation valve rather than an elastomer sleeve, we also build Slurry Knife Gate Valves, and for metering duties we supply peristaltic Hose Pump units that share the same hose-and-compression principle.

Sleeve Materials and Media Matching

The rubber sleeve is the core component and the only part in contact with the process medium. We select the compound from the actual working conditions rather than from a generic table, because temperature, pH, particle size and solids concentration all change sleeve life.

Body materials are carbon steel, ductile iron or SS304 as standard, with other options available. Stems are SS304 and fasteners SS201, 304 or 316. Because the body never touches the medium, an economical carbon steel housing can be paired with a high-performance sleeve instead of upgrading the whole valve to an alloy body.

Connection and Actuation Options

We configure the valve around the pipe interface and the control philosophy of the line. Flanged connections are standard; wafer, threaded, welded, clamp and high-pressure patterns are available depending on size and rating.

Pneumatic actuators can be supplied with solenoid valves, limit switches and air preparation so the valve arrives ready for the plant control system. Electric modulating units accept standard control signals for closed-loop duty. We confirm the interface during configuration rather than assuming a default.

Engineering Value and Quality Control

We are the lead drafting unit of the Chinese industrial standard for pinch valves and a national high-tech enterprise holding invention and utility model patents. Our manufacturing base includes large-scale vulcanization equipment, rubber refining equipment and rubber raw material testing facilities, which is what allows us to produce consistent sleeves at large diameters rather than only small standard sizes.

• In-house rubber compounding and vulcanization: controls sleeve wall thickness, hardness and uniformity, which directly govern closure quality and wear life.
• Raw material testing: incoming rubber is checked before it enters production, reducing premature sleeve failure.
• Large-part machining: body and pinch-bar components are machined to suit the sleeve geometry and the required face-to-face dimensions.
• Management systems: ISO 9001 quality management, ISO 14001 environmental management, ISO 45001 occupational health and safety and ISO 50001 energy management certification, plus EU CE, RoHS and TR-CU (EAC) certification.

Every valve is assembled around a tested sleeve, and the closing geometry is verified so the sleeve seals along the full bore rather than at a single contact line. Where a project requires documented inspection, we agree the test scope and records before manufacture.

Installation, Maintenance and Serviceability

The full-bore sleeve leaves no cavity or dead corner, so the line drains cleanly and pressure loss stays low. Centerline closing forms a smooth, closed venturi that sheds crystallized particles with each stroke, which is why these valves rarely jam even on high-solids service.

• Install with sufficient clearance for sleeve replacement; open-body designs give direct access without removing the whole valve.
• Pneumatic units need a stable, dry air supply at the specified pressure; fluctuating air pressure causes partial closure and uneven sleeve wear.
• The sleeve is the only wear part. Replacing it restores the valve to near-new condition instead of replacing the entire body and actuator.
• We supply replacement sleeves and can advise on inspection intervals based on stroke frequency and solids loading.

Because the body and actuator are reusable, lifecycle cost is concentrated in a single consumable component. That is the main reason our valves are used to replace conventional metal-seated valves on abrasive lines.

Information We Use to Configure Your Solution

To prepare a suitable configuration and quotation, we work from the actual working point rather than a nominal size. The following inputs let us select the body style, sleeve compound, connection and actuator in one pass.

Send the working conditions and we will return a configuration with the recommended body style, sleeve material, connection and actuation, together with the drawings and data needed for approval. Customization is available across sleeve design, body material and actuator arrangement.

Frequently Asked Questions

What sizes and pressure ratings can Fengchi supply?

Our pinch valves cover DN15 to DN2000 and PN6 to PN40, with the exact rating depending on size, connection type and actuation method. Large-diameter valves from DN600 to DN2000 are produced in-house using our large-scale vulcanization and rubber refining equipment.

How does a pinch valve achieve zero leakage with solids in the line?

Sealing comes from full compression of the elastomer sleeve along the centerline, not from metal-to-metal contact. The sleeve collapses completely across the bore, so particles, fibers and viscous media cannot create a bypass path. This gives bidirectional Class V shut-off and self-cleaning on every stroke.

Which sleeve material should be used for a corrosive or high-temperature medium?

Standard NR sleeves suit mineral slurry, mud and paper pulp up to 80 °C. For acids, alkalis and salt solutions we select EPDM, and for oily media NBR. Other compounds are available, with temperature capability up to 160 °C depending on the formulation. We match the compound to the pH, temperature, particle size and corrosiveness of the actual medium.

Can the valves be integrated into an automated control system?

Yes. We supply pneumatic single-acting and double-acting actuators, electric on-off and modulating actuators, hydraulic actuators and pneumatic modulating units with positioners. Solenoid valves, limit switches and air preparation can be included so the valve interfaces directly with the plant control system.

What maintenance does a pinch valve require?

The sleeve is the only wear part. When it reaches the end of its service life, replacing the sleeve restores the valve to near-new condition without replacing the body or actuator. Open-body designs allow direct access for faster sleeve changes. We supply replacement sleeves and can advise on inspection intervals based on cycle frequency and solids loading.

What certifications support Fengchi pinch valves?

Our manufacturing is covered by ISO 9001 quality management, ISO 14001 environmental management, ISO 45001 occupational health and safety and ISO 50001 energy management certification, along with EU CE, RoHS and TR-CU (EAC) certification. We are also the lead drafting unit of the Chinese industrial standard for pinch valves and a national high-tech enterprise.