Description

Manufactured by ENMAK Makina, the pneumatic knife gate stock valve is an industrial valve widely used across the paper and pulp industry as one of the best solutions for automatic flow control in confined spaces. Its one-piece stainless plate and full-bore body eliminate the fiber build-up, jamming and constant cleaning problems experienced with globe, cone and conventional gate valves — providing trouble-free operation. Built with engineering expertise dating back to 1975, our pneumatic knife gate stock valves fit modern automated production lines perfectly, with a wide size range from DN 50 to DN 600, PN16-standard flanged connections and a PLC-ready pneumatic actuator.

Working Principle

Designed for automatic flow control in confined spaces, the pneumatic knife gate stock valve is the solution of choice across the paper and pulp industry. The valve works by a one-piece stainless steel blade (plate) moving vertically inside the body under the control of the pneumatic actuator mounted on top.

When compressed air is supplied to the actuator, the piston in the cylinder drives the blade up or down; the blade cuts across the flow channel for full closure or full opening. Commanded by solenoid valves for integration with plant automation, the valve can be opened or closed in seconds at the push of a panel button or by a PLC command.

The full-bore body prevents fiber build-up, jamming and clogging. By eliminating the fiber accumulation and constant cleaning problems that conventional globe, cone and gate valves suffer with stock and fibrous fluids, it fits modern automated production lines perfectly.

Key Features

Automatic Pneumatic Operation

Remotely operated via a compressed-air actuator; integrates with PLC and automation systems.

Fast Response Time

By nature, the pneumatic system responds far faster than manual valves — dependable in emergency stop and process control applications.

One-Piece Stainless Plate

Produced in various profiles, the one-piece stainless steel plate performs open-close duty flawlessly with high wear resistance.

Clog-Free Full Bore

The full-bore body prevents fiber build-up, jamming and clogging — easy, continuous operation.

PLC ve SCADA Uyumlu

Can be equipped with limit switches and position sensors, integrating fully with your existing PLC and SCADA systems.

Multi-Duty Flexibility

Comfortable in different duties — as a chest drain valve, a regulating valve or an in-line isolation valve.

PN16-Standard Flanges

Flanged connections are produced to the PN16 standard, mounting to existing pipelines without complications.

Low Maintenance

A robust mechanical design makes maintenance easy; replacement plates, seals and actuator spares ship quickly from our stock.

Technical Considerations

  • Operating Pressure: Maximum 4–6 bar
  • Operating Temperature: 80 °C (depending on material)
  • Flange Connections: To the PN16 standard
  • Actuator: Pneumatic (operates on compressed air)

Technical Drawings & Dimension Tables

Valve Dimension Drawing

Knife gate stock valve dimension drawing - D, h, H, A, C, L dimensions

On DN 350 and larger models, a 4 mm pitch is applied to the valve stem.

Dimensions & Weights by DN

DN 50 65 80 100 125 150 200 250 300 350 400 450 500 600
L 40 40 40 40 40 50 50 50 55 55 65 70 70 85
h 250 275 315 360 400 465 580 690 785 900 1030 1140 1240 1470
H 335 360 320 485 550 640 813 970 1100 1260 1440 1620 1795 2115
A 125 137 160 178 207 237 290 350 405 445 505 560 613 700
C 95 95 110 115 120 125 145 150 150 175 185 185 210 210
D 16 160 200 250 250 300 350 350 400 400 450 450 500 500
Weight (kg) 7,1 7,9 10,8 13,4 16,3 24,1 36,2 48,9 67,5 96,8 137,2 164,6 188,1 275,3
Working Pressure (bar) 5 3,5 3

Dimensions, weights and maximum working pressures for all models from DN 50 to DN 600 (in mm and kg).

Blade / Plate Profile Options

Knife gate stock valve plate profile options - different closure profiles from DN50 to DN600

Different plate section profiles are produced from DN 50 to DN 600 to suit your line and application.

Flange Connection Dimensions

DN 50 65 80 100 125 150 175 200 250 300 350 400 450 500 600
Thickness 40 40 40 40 40 50 50 50 50 55 55 65 65 70 85
LKr. 125 145 160 160 210 240 270 295 350 400 460 515 565 620 725
Civata M16 M16 M16 M16 M16 M20 M20 M20 M20 M20 M20 M24 M24 M24 M27
Thread Depth 13 13 13 15 15 15 15 15 17 17 13 25

Dimensions in mm

Flange thickness, bolt size and thread depth values for all models from DN 50 to DN 600 (mm).

Stock Valve Flange Dimensions

Stock valve flange dimensions DN 50-600 - through-threaded, blind-threaded, bolt hole positions

Positions of through-threaded holes, blind-threaded holes and flange bolt holes by DN.

Applications

The pneumatic knife gate stock valve serves on every industrial process line where fibrous, solids-laden fluids must be controlled automatically. It is above all indispensable in highly automated modern paper mills.
Main application areas:

  • Automated Paper & Pulp Mills
    Automatic flow control at pulper outlets, stock transfer lines and headbox feed lines on PLC- and SCADA-managed production lines.
  • Stock Preparation Lines
    Preferred on the inlet and outlet lines of hydrapulpers, broke pulpers and agitator systems, in automatic filling and draining processes.
  • Recycling Plants
    Remote-controlled operation on mixed stock lines in recovered paper plants, where plastics, strings and other contaminants may be present.
  • Board & Corrugated Plants
    Serving automated stock distribution and transfer systems on test liner, fluting and corrugated board lines.
  • High-Capacity Production Lines
    In fast, continuously running modern plants — on long pipelines and elevated valve positions where manual operation is impractical.
  • Wastewater & Sludge Lines
    Automatic isolation duty on fiber- and solids-laden sludge lines in the effluent treatment units of paper mills.
  • Chemical Process & Food Plants
    Used with confidence on automated process lines in the chemical, food and beverage sectors handling dense, fibrous or sticky fluids.

Why the Pneumatic Knife Gate Stock Valve?

If you are looking for reliable flow control in confined spaces, trouble-free operation against fiber build-up and jamming, and full compatibility with modern automation, the ENMAK Makina pneumatic knife gate stock valve offers a dependable solution built around your needs. With its one-piece stainless plate and full-bore body eliminating the fiber build-up, jamming and constant cleaning problems of globe, cone and conventional gate valves, it helps you optimise your paper and pulp production processes for quality and efficiency. Fitting modern production lines perfectly with a size range from DN 50 to DN 600, PN16-standard flanges and a PLC-ready pneumatic actuator, ENMAK Makina stands beside you with engineering knowledge, manufacturing experience and a customer-focused approach dating back to 1975.

ONE STEP TO THE SOLUTION

The right solution for your project is just one step away.

From the paper industry to heavy manufacturing, we deliver solutions tailored to your project with engineering expertise dating back to 1975. Contact us for a detailed quotation or to discuss your technical requirements — our engineering team will get back to you promptly.

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Category: Stock Valves