Pneumatic Knife Gate Valve PZ673

Product Overview of Knife Gate Valves

■ Product Overview of Knife Gate Valve Manufacturer

The knife gate valve, also known as the knife闸 valve or knife slurry valve, was introduced to China in the 1980s. It finds application in a wide variety of fields—from coal preparation, gangue removal, and slag discharge in mines and power plants, to urban sewage treatment; from slurry transportation in cement and paper mills, to specialized pipelines in the food, sanitary, and pharmaceutical industries. With its ultra-thin design, the knife gate valve boasts advantages such as small size, light weight, minimal flow resistance, no accumulation of residue, ease of installation, and simplicity of disassembly. These features thoroughly address the shortcomings of conventional gate valves, flat-plate gate valves, ball valves, globe valves, control valves, butterfly valves, and other types of valves—namely, large flow resistance, bulky size, tendency to accumulate residue, and difficulties in installation and maintenance. As a result, a large number of general-purpose shut-off valves and regulating gates have been replaced by knife gate valves.

■ Media suitable for knife gate valves

Gold ore powder, tailings, mineral sand, slag, coal slime, sand and gravel, steel slag, pulp, wood pulp, cement slurry, fibers, dust, powders, crystals, chemically treated wastewater, slaughterhouse effluent, municipal sewage, settled oil, asphalt, silo outlets, fruits, grains, beer, beverages, oils, steam, gas transmission, as well as power plant water supply and drainage, and slag disposal.

■ Instructions for Selecting Knife Gate Valves

1. When making a purchase, users must specify the valve’s operating conditions, fluid medium, working pressure, medium temperature, nominal diameter, valve material, and quantity.

2. If the required valves have special requirements, the customer must provide detailed drawings and specify these requirements in the purchase and sale contract. Our company will manufacture the valves according to the customer’s specifications.

3. Unless otherwise specified, the valve actuator brand and model shall be the standard model provided by our company.

■ Knife Gate Valve Parameter Range

     Design and manufacturing standards: JB/T 8691-1998

Structural length standard: GB/T 15188.2-94

Flange Connection Standard GB/T 9113.1-2000

Valve body material: Q235 Cast steel ( WCB ) Stainless steel ( CF8, CF8M, CF3M, 310S, 2520)

       Sealing material : Rubber ( NBR, EPDM Tetrafluoro ( VITON.PTFE Polyurethane (PU)

       Stainless steel ( Cr13.304.316L) Cemented carbide ( STL/K20/YG8 ) Engineering ceramics ( AL203 )

Sealing structure: unidirectional sealing, bidirectional sealing

Valve structure: rising stem or non-rising stem, through-bore or double-opening.

Support structures: triangular type, four-column type, steel plate type, concealed plate type, arch bridge type (unique structure)

Connection types: Round flange, flanged (dumbbell-shaped), lug-type (clamp-type)

Nominal diameter: DN50~DN2000 NPS 2 ” ~80 ”( Customizable according to customer needs. DN3000 The following special calibers)

Operating temperature: -40 Celsius ~1000 ℃ (based on the specific temperature range for model selection)

Nominal pressure: DN50~600 ( 0.5 MPa, 1.0 MPa, 1.6 MPa, 2.5 MPa, 10K, 150 Lb ) (Hydraulic pressure testing of professional equipment)

      DN700~3000 (0.25 MPa, 0.6 MPa, 1.0 MPa) Dedicated sealed lid water pressure testing

Executing agency: Handwheel ( DN50-DN600 )

Pneumatic actuator ( DN50-DN1000 )

Pneumatic actuator ( DN50-DN600 )

Electric actuator ( DN50-DN2000 )

Hydraulic actuator ( DN50-DN2000 )

Electro-hydraulic actuator ( DN50-DN2000 )

Sprocket and chain ( DN50-DN2000 )

Bevel gear actuator ( DN50-DN2000 )

PZ673W, H, X, F

Pneumatic Knife Gate Valve

Pneumatic Knife Gate Valve

■ Product Overview

   The pneumatic knife gate valve is a relatively complex automated control instrument, composed of various pneumatic components and a valve body. It is widely used in applications requiring rapid shut-off or opening. This valve is suitable for pipelines conveying media such as sugar, pulp, sewage, coal slurry, ash residue, dust, and slurry-water mixtures. It can be used both for media shut-off and throttling. The knife gate valve is ideally suited for horizontal installation, but can also be installed at an angle. A double-acting cylinder provides two-position control for opening and closing the gate; a single-acting cylinder ensures that the gate automatically opens or closes—in a normally closed or normally open configuration—when the electrical or pneumatic circuits are interrupted or fail.

■ Technology Parameter range

  Nominal pressure: 0.6 MPa, 1.0 MPa, 1.6 MPa, 2.5 MPa, 10K, 150 Lb

Nominal diameter: DN50~2000mm NPS 2 ” ~80 ”

Operating temperature: 0 to +1100 ℃ (the specific temperature range depends on the material of the sealing element and the properties of the medium)

Link flange: ANSI B16.5 、 GB/T 9113 、 JB/T 79 、 HG 、 SH 、 JIS 、 DIN 、 NF 、 BS

Main material: C.I、 WCB 、ZG1Cr18Ni9Ti、ZG1Cr18Ni12Mo2Ti、CF8、CF8M、CF3、CF3M、2Cr25Ni20

Sealing types: hard seal, soft seal

Leakage amount : Hard seal: D (Liquid) 0.1XDNmm3/s Soft sealing: A (Zero Leakage)

Accessory components: 1. Install the flange .  2. Solenoid valve, air filter, limit switch

Air source pressure: 0.4–0.6 MPa

Solenoid valve voltage: DC 24V AC 220V

   Valve installation is shown in the diagram.

Schematic diagram of required accessories for installation:

1. For blind hole installation, use the matching component: short external hexagonal bolt. *n Hexagon nut *n Flat washer or spring washer *n
2. Through-hole installation using matching components: long external hexagonal bolt *n Hexagon nut *n Flat washer or spring washer *n
3. Metal-wound gasket or rubber gasket *2 Each valve per piece
4. Torque wrench *2

Note: n the number of = For the number of bolt holes and bolt lengths, please consult our technical staff.