What is a Knife Gate Valve?

Knife gate valves are engineered specifically for on-off and isolation operations in systems with a high dissolved solid particle. Knife gate valves are extremely useful when dealing with slurry, abrasive, corrosive, and viscous media. The valves have a low-pressure drop in the fully open position, are simple to operate, light in weight, and cost-effective.

Knife gate valves are intended to work in the harshest conditions, with a sharpened blade to cut through heavy liquids.

They are extremely helpful in wastewater applications where corrosion is a major concern. In addition to the valve design that is optimized for slurry media, having a knife gate valve composed of acid-proof stainless steel is advantageous because it is less vulnerable to corrosion damage and therefore requires less frequent maintenance or even replacements.

Knife gate valves should always be used for applications that require a fully open or completely closed position and should not be used to regulate flow unless specifically designed for it. When fluid is pushed against a partly closed gate, a vibration occurs, gradually eroding the disc and seat. Furthermore, the knife gate valves are intended to open and close slowly to protect against the effects of the water hammer.

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Specifications of Knife Gate Valve

• Available materials: WCB, WC6, WCC, LCB, LCC, Cast iron, Ductile Iron, SS316, SS304
• Size: 2″ to 80″
• Class: 150 to 300
• Nominal Pressure: PN6 to PN40
• Operation: Handwheel, Electric and Pneumatic Actuated, Gear operated
• Ends: Wafer, Lug, Flanged

Types of Knife Gate Valve

• Uni-directional Knife Gate Valve
• Bi-directional Knife Gate Valve
• Slurry Knife Gate Valve

Where is a Knife Gate Valve used?

Knife gate valves are commonly used in mining, power plants, and the paper, chemical, and food industries. They have the advantage of being very compact due to the linear movement of the shut-off damper (plate that blocks the flow of fluid in the closed position). The knife gate valve is mainly a shut-off valve, although it can be used as a control valve when the shutter is placed in the partially open position.

Knife gate valves can be used for fluids loaded with solid particles such as wastewater or sludge. As a general rule, the knife gate valve is designed to be sealed on the upstream side of the circuit (on the fluid inlet side), but some valves are sealed on both sides, allowing them to be used regardless of the direction of fluid flow. In the open position, the head loss is very low because the valve does not cause a change in the fluid direction.
The closing and opening time can be very long, however, and you should consider regular maintenance to correct wear problems between the shutter and sealing elements.

Features of Knife Gate Valve

• Reliability of operation
• The cast body of the valve is dust-tight assuring a clean operation
• Knife action to cut through a standing column of material
• Short opening and closing time
• Maintenance is easy with replaceable packing
• Modular design permitting upgrades to pack and operators

World’s Largest Gate Valve

Texas, the second largest state in the USA both in the area and population faces enormous demand for drinking water. Within Texas lies America’s largest inland metropolitan area, Dallas – Fort Worth Metroplex (DFW) province which is the economic and cultural hub of North & Central Texas.

The water in DFW is both sourced and managed by two major Texas water authorities, Tarrant Regional Water District (TRWD) & Dallas Water Utilities (DWU). With the rapidly growing population in this area, it is expected that more than 13 million residents will need water by 2060 which is more than double the population served by the authorities today. As a result, they have partnered to execute the $2B Integrated Pipeline Project (IPL) which will enable them to increase the water supply by 350 million gallons per day (1.59 billion liters per day) meeting the ever-increasing demand in the long term.

Knife Valve Factory

We specialize in custom knife gate valves from 2″ to 96” and above, utilizing carbon steel to stainless steel and other weldable alloys. Our staff has many years of combined experience in building knife gate valves in particular.