Thicker Knife Gate

• Thicker knife gate to eliminate distortion under maximum differential pressure and to provide tight seating (see page 12).
• Precision ground blade on both sides for tighter packing chamber sealing. Sealing face of the gate is lapped to provide the best possible seat tightness.
• Precision machined beveled gate end provides long life of seating components.
• Gate guides and lugs. 180° guiding for the moving gate, while jambs at the bottom hold the knife gate to assure proper seating.
• Integral locking device.

RAISED FACE SEAT

• The groove around the seat permits the gate to push particles aside and prevents clogging. When the valve is open the flow cleans the groove.
• Lapped seat ensures tight closure.

RELIABLE PACKING CHAMBER

• Smooth and uniform chamber.
• Gate ground on both sides.
• Equally distributed gland bolts provide uniform compression of packing
• Gland bolts easily accessible.

ALL NUTS SELF-LOCKING

LOW TORQUE STEM DRIVE ASSEMBLY

Ni-resist or bronze thrust bearing to prevent seizure of handwheel hub, 2-12” valves.

• Needle thrust bearings, 14-36” valves
• Larger more comfortable malleable iron handwheel for easier operation.
• Grease fitting.
• Acid resistant Ni-resist or bronze stem nut.

FACTORY TESTING

• Each valve is pressure tested for seat tightness, shell and packing integrity including cycling tests to check for reliability of operation.

ALL STAINDLESS STEEL STANDARD KNIFE GATE VALVES WAFER- TYPE, RESILIENT SEAT, 2-36” (50-900mm)

FULLY LUGGED, TYPE 320C TO TAPPI TIS 405-8, LARGE PORT

1. Other materials available (see page 17).

DESIGN FEATURES:

• Designed to handle slurries, pulp stock and corrosive fluids in process industries.
• Meets TAPPI standard TIS 405-8 and MSS SP-81 for wafer-type knife gate valves.
• Flanges match ASME B16.5 Class 150. Holes tapped.
• 150 psig (10.3 bar) max. working pressure. 150°F (65°C) max. working temperature. Applications outside of these conditions require special design considerations.
• Factory installed V-port seat insert available for metering or throttling service (page 10).
• These high quality metal-seated knife gate valves with ground knife gates and lapped seating faces have maximum leakage rate 4-10 times less than the permissible rates shown in TAPPI 405-8 & MSS SP-81.
• Needle bearings on 14-36” valves.
• Available with lever, chain, gear, electric, air or hydraulic actuation (see page 14).

DIMENSIONS AND WEIGHTS

ALL STAINDLESS STEEL STANDARD KNIFE GATE VALVES

WAFER-TYPE, RESILIENT SEAT, 2-36” (50-900mm)

FULLY LUGGED, TYPE 320C TO TAPPI TIS 405-8, LARGE PORT

Other materials available (see page 17).

DESIGN FEATURES:

• Designed to handle slurries, pulp stock and corrosive fluids in process industries where applications call for resilient seat with zero leakage to 150 psi (10.3 bar) in main direction and limited tightness in opposite direction, at low pressure.
• Replaceable, resilient crimped seat rings.
• Meets TAPPI standard TIS 405-8 and MSS SP-81 for wafer-type knife gate valves.
• Replaceable seat extends the service life of the valve. Resilient seats can be easily replaced after removing valve from the line (Details on page 12).
• For highly abrasive applications we can supply a replaceable seat ring with a hardfaced knife surface.
• Non-clogging large port.
• 150 psig (10.3 bar) max. working pressure. 150°F (65°C) max. working temperature. Applications outside of these conditions require special design considerations.
• Needle bearings on 14”-36” valves.
• Available with lever, chain, gear, electric, air or hydraulic actuation (see page 14).

DIMENSIONS AND WEIGHTS

ALL STAINDLESS STEEL STANDARD KNIFE GATE VALVES

FLANGED, RESILIENT OR METAL SEAT, 2-24” (50-600mm)

TYPE 332C THROUGH-BOLTED FLANGES ASME B 16.5 CLASS 150, LARGE PORT

1. Other materials available (see page 17).
2. Also available with integral metal seats.

DESIGN FEATURES:

• Designed to handle heavy slurries, pulp stock and corrosive fluids in process industries.
• Cast in austenitic stainless steel (30”, 36” may be fabricated).
• Has through-bolted, rigid flanges matching B16.5 Class 150 regular, short-body type.
• Non-clogging full port design (metal seated valve).
• 150 psig (10.3 bar) max. working pressure. 150°F (65°C) max. working temperature. Applications outside of these conditions require special design considerations
• The high quality metal seated knife valve with ground and lapped seating face have maximum leakage rates 4-10 times less than the permissible rates shown in TAPPI TIS 405-8 and MSS SP-81.
• Available with lever, chain, gear, electric, air or hydraulic actuation (see page 14).

DIMENSIONS AND WEIGHTS

BOLTED BONNET KNIFE GATE VALVES DESIGN FEATURES NO LEAKAGE TO THE EXTERIOR THROUGH PACKING CHAMBER

(UNLIKE STANDARD KNIFE GATE VALVES)

• Bonnetted design. Standard body-bonnet joint with an efficient non-asbestos reinforced fiber or PTFE gasket.
• Long-life leakproof stem seal. Standard packing chamber with 125 RMS wall finish, burnished non-rotating stem and PTFE or graphite packing rings. Many times the cycle life of a standard knife gate valve.
• Virtually no contamination of the environment. No dewatering of stock, unlike standard knife gate valves.
• Easy repacking in-line. (Valve should be de-pressuized when repacking in-line.)

TIGHTER SEATS WITH PATENTED TORQUE CLOSURE OF KNIFE

• Beveled knife-stem connection locks the knife blade tight against the seat. The seat is sealed by positive torque closure – not media pressure-unlike any other knife gate valve.
• Raised-face seat. A groove around the seat collects particles pushed aside by the knife and prevents clogging. When the valve opens, media pressure cleans the groove.
• Lapped seat ensures tight closure.
• Crimped resilient seat ensures longer service life (see pg.11).
• Four seat designs: Integral, resilient and renewable Stellite 6 (see pg. 10).

BYPASS TO PREVENT CLOGGING OF BONNET

• Bypass lets pulp circulate inside the bonnet when valve is opened, preventing clogging (patent #2093539 CDN and # 5295661 U.S.).

EASY OPERATION

• Lower running torque due to reduced friction. Friction between stem and packing in bolted bonnet knife gate valve is far less than the friction between the blade and the packing in a standard knife gate valve.
• Low-friction, acid-resistant Ni-Resist stem nut.
• Valves can operate with smaller actuators than standard knife gate valves.

ALL CAST STAINLESS STEEL DESIGN

• One-piece stainless steel, fully-lugged, cast body is stronger than welded bodies and less subject to distortion due to thermal stress. Posts are stainless steel instead of chrome-plated carbon steel for longer life.
• Designed for vertical or horizontal line operations.
• Standard wafer, TAFFI face-to-face for easy replacement of leaky standard knife gate valves.
• Maintenance and adjustment-free. Long cycle life.
• Suitable for most pulp and paper applications. Can be used throughout the mill as a general-purpose knife gate valve.

THE ENPRO BOLTEL BONNET KNIFE GATE VALVES

PROVIDES POSITIVE SEATING ON THE BOTTOM ABD THE TOP OF THE BLADE

• Patented knife – stem connection. Unlike any other design, the stem head slides inside a circular cavity on the stem guides in the body and bonnet, and is connected to the knife blade by a taper slot. A roller prevents the stem from rotating.
• Handwheel torque or actuator force provides positive seat-knife closure. During closure, the stem slides down pushing the knife into contact with the two bottom lugs. The taper stem head then transfers a vertical closing force to a lateral force which positively seats the knife against the seat face. Stem force, not line pressure, maintains seating contact in this unique design, ensuring tight seating in both directions (see alternative seat designs on page 10). During the opening and closing cycle, the guides ensure proper alignment of the knife.

ALL STAINLESS STEEL BOLTEL BONNET KNIFE GATE VALVES

FULL PORT, 4-24” (100-600mm)

FOR BIDIRECTIONAL SHUT OFF UP TO 150 PSI (10.3 BAR)

FULLY LUGGED TYPE 310B MEAL SEAT

DESIGN FEATURES:

• All stainless steel construction.
• Seat tightness achieved with torque as opposed to line pressure.
• Thoroughly tested in a variety of applications including: clean pulp up to a consistency of 5%, waste water and secondary effluent.
• Bypass unit cast into the bonnet prevents clogging.
• Conventional packing chamber eliminates leakage problems associated with standard knife valves.
• 150 psig (10.3 bar) max. working pressure.. 150°F (65°C) max. working temperature.
• Applications outside of these conditions require special design considerations.

DIMENSIONS AND WEIGHTS

ALL STAINLESS STEEL BOLTEL BONNET KNIFE GATE VALVES

FULL PORT, 4-24” (100-600mm)

FOR BIDIRECTIONAL SHUT OFF UP TO 150 PSI (10.3 BAR)

FULLY LUGGED TYPE 320B RESILENT SEAT

• PTFE recommended as standard. Other materials available.
• Other materials available (se page 17).

DESIGN FEATURES:

• All stainless steel construction.
• Seat tightness achieved with torque as opposed to line pressure.
• Bidirectional shut off from 0 to 150 psi (10.3 bar).
• Thoroughly tested in a variety of applications including white water and weak black liquor
• Bypass unit cast into the bonnet prevents clogging.
• Conventional packing chamber eliminated leakage problems associated with standard knife valves.
• 150 psig (10.3 bar) max. working pressure.
• 150°F (65°C) max. working temperature.
• Applications outside of these conditions require special design considerations.

DIMENSIONS AND WEIGHTS

OPTION

• DEFLECTION CONES
• In stainless steel or other materials are available to divert the flow of abrasive slurries and protect valve seat from abrasion.
• Typical applications include dry solids, storage bins, bottom valves, mining slurries, fly ash, filters, cyclons, etc. The cone is installed between valve and pipe flange.
• “V” ORIFICE
• Flow data on page12.
• OPERATION
• Handwheel, quick lever, chain wheel, bevel gear, on-off cylinder actuators, positioning cylinder actuators, electric actuators.
• BONNET PURGE CONNECTORS
• For very fine slurry lines, purge connection are recommended, Purging is used to prevent packing of material in bonnet areas.
• BODY PURGE CONNECTIONS
• For higher density pulp applications consult factory.

Stem protectors available upon request

ALTERNATIVE SEAT DESIGNS

Integral Stellite 6 Hardfaced Seat with Special Body Designed to Match Basalt Pipe Flanges

• (available on Bolted Bonnet Knife Gate Valve only)
• Tough Lignite bottom ash slurry service

2-16” STANDARD KNIFE GATE VALVES

INTERAL CRIMPED RESILIENT SEAT

A NEW INTEGRAL CRIMPED RESILIENT SEAT IS NOW STANDARD ON 2-12” STANDARD KNIFE GATE VALVE

Old “snap-in” style seats could be too easily extracted accidentally by friction caused by heavy or infrequent cycling. Velan’s new “crimped seat” makes accidental extraction virtually impossible. The seat will wear normally but the crimped design keeps it tight inside the seat retainer ring for a longer cycle life.

18-36” STANDARD KNIFE GATE VALVES & BOLTED BONNET KNIFE GATE VALVES ALL SIZES

STAINLESS STEEL SEAT RING WITH REPLACEABLE CRIMPED RESILIENT SEAT OPTION PREVENTS ACCIDENTAL EXTRACTION

CRIMPING THE SEAT STEP BY STEP

• The stainless steel seat ring is manufactured with a slight inside taper.
• The O-ring is inserted.
• Seat ring is progressively crimped on a lathe to imprison the O-ring in it.

LOW RESTRICTION LUGS BOTTOM

An important breakthrough in bottom lug design for Pulp and Paper applications, the Velan Bolted Bonnet Knife Gate valve features a bottom lug that permits longer fibers to circulate on each side preventing clogging during closing. This improvement is currently available on most sizes.