AVK knife gate valves
We offer knife gate valves with lever, handwheel, pneumatic actuator, ISO top flange for actuator or complete with electric or pneumatic actuator. The valve design permits a simple and rapid change of actuator.
Knife gate valves are especially useful in wastewater applications
Knife gate valves are designed to work in some of the harshest environments and mainly for on-off and isolation services in systems with high content of suspended solids. They are especially beneficial for handling slurry in addition to viscous, corrosive and abrasive media and are therefore often used in wastewater and biogas applications as they are designed with a sharpened blade to cut through heavy liquids.
Knife gate valves with high quality materials and excellent design features
They are full bore valves permitting easy passage of liquid of whatever viscosity and there are no body cavities below the gate where the medium can collect. The valves are self-cleaning as particles will be pushed off the gate when opening the valve, and gate scrapers and deflector cones can be provided for particulate or abrasive media for extra protection of the packing gland. Also, the top packing gland is replaceable which enables replacement of the sealing without disassembly of the valve.
The design of our knife gate valves is simple and allows easy maintenance and cost effective installation. The valves are bi-directional and allow installation without any restrictions as to the direction of the flow. A protected sealing, high quality materials and a full, plain bore lead to a great performance and a long service life.
Our knife gate valves are as standard with body of ductile iron and seat of NBR, and optionally of other materials such as body of stainless steel and seat of FKM, PTFE, EPDM, natural rubber or polyurethane depending on the service medium and the temperature at operation (NBR max. 80˚ C, PTFE max. 220˚ C, FKM max. 260˚ C). The valves are coated with fusion bonded epoxy for optimal protection.
Feature summary
- ATEX approved (94/9/94EC)
- Bi-directional
- Full bore and plain bottom
- U-shaped reinforced NBR sealing
- Gate supports integrated in the body
- Slim design and low weight
- Scraper as optional extra
- Encaged stem with yokes prepared for inductive censors and micro switches
- Stem/gate connection with self-locking nuts
- Replaceable top packing gland
- Washers under the secondary bolts protect the coating
Actuators with low energy consumption
When combining an AVK knife gate valve with a linear electric actuator from LINAK you get easy installation, minimum maintenance and low energy consumption. Linear actuators use less energy than actuators using compressed air, and AVK knife gate valves with linear actuators have proven to be a great choice for processes at wastewater treatment plants where butterfly valves traditionally have been used.
- Our solution features very easy installation and adjustment that does not require assistance from an external technician:
- Very compact, low weight and minimal space requirements
- Self-locking with very precise positioning
- Integrates with existing control, regulation and monitoring systems
- In case of power failure, the valve can be opened and closed manually. A battery back-up is available as an optional extra.
AVK knife gate valves for aeration
Aeration is the most energy consuming activity on a wastewater treatment plant and this process typically counts for as much as up to 50% of the total power consumption at the plant.
Knife gate valves provide a more precise regulation than butterfly valves traditionally used in the aeration tanks. We offer knife gate valves variants with a V-port, allowing for even better control due to the V-port design being able to regulate the flow with high precision. Using our knife gate valves as part of the aeration process also brings a number of other advantages. The knife gate valve has a compact design so that it does not take up too much space and it requires less maintenance than e.g. butterfly valves. The linear actuators use significantly less energy compared to traditional electrical actuators and will thus also contribute significantly to a reduction of the energy consumption at the wastewater plant.
