The Stafsjö HG Knife Gate Valve represents the top of high-performance engineering.
Specifically built to handle highly concentrated and static media columns, the HG valve is an industry-leading solution for demanding applications across a wide range of sectors, including pulp and paper, mining, and power generation. Its modular design, advanced sealing technology, and robust construction make it a versatile and dependable choice for complex process conditions.
When the HG valve is in the open position, it provides a full bore and unobstructed flow path. This ensures outstanding flow characteristics while preventing media build-up, which could otherwise compromise performance or require additional maintenance. The valve’s PTFE seats are safeguarded by the gate and reinforced with retainer rings, while internal back-up O-rings ensure that the seats remain consistently pressurized against the gate.
For abrasive processes, the HG can be equipped with polyurethane retainers and seats, offering enhanced durability. Alternatively, for extreme high-temperature applications, a metal-only configuration can be utilized, showcasing the valve’s adaptabvility to diverse operating environments.
The HG valve is engineered to provide bi-directional zero-leakage shut-off, even when handling highly concentrated or difficult media. Its gate is guided throughout the full stroke, ensuring smooth and efficient operation.
The retainer ring system on both sides of the gate delivers a tight seal regardless of pressure direction, making the HG an excellent choice for applications where pressure fluctuations or bidirectional flow occur.
In addition, the gland box sealing system is equipped with three layers of Stafsjö’s TwinPack, preventing any media from reaching the surrounding environment. For applications with exceptionally demanding conditions, optional extra scrapers or a double gland can be integrated, enhancing the valve’s ability to handle tough media while maintaining complete sealing integrity.
The HG knife gate valve’s modular design allows for easy customization to meet specific process requirements. It can be configured with a variety of materials, actuators, and automation accessories, making it suitable for applications involving pulp stock up to 18% consistency, slurry, liquor, ash, and granulates. Commonly used in junction traps, the HG valve often serves as an inlet valve in combination with Stafsjö’s RKO discharge valve for comprehensive system solutions.
Standard valve body options include stainless steel or nodular iron, but the HG can also be manufactured in high-alloy materials such as Duplex or 254 SMO equivalent for applications requiring enhanced corrosion resistance. For extreme process demands, Stafsjö offers additional models based on the HG, such as the high-pressure HP, the compact HL, the titanium HPT, and the extreme high-pressure HX.
The HG valve is built with a rigid two-piece precision-machined valve body and high-strength top works, ensuring precise gate alignment throughout the entire stroke. This alignment reduces stress on the valve components, minimizing wear and extending the valve’s service life.
The PTFE seats and back-up O-rings are secured by retainer rings, which are mechanically locked in place to maintain exact positioning during operation. This precise engineering not only enhances the valve’s performance but also simplifies maintenance procedures, reducing downtime and associated costs.
Maintenance of the HG valve is straightforward and efficient. The retainer rings are designed to hold the seats and back-up O-rings in their exact positions as the gate strokes, ensuring consistent performance. These rings are easy to remove, enabling quick seat replacement without the need for extensive disassembly.
The availability of retainer rings and seats in a variety of materials adds to the valve’s flexibility, allowing it to be adapted to different process conditions. Whether handling abrasive, corrosive, or high-temperature media, the HG valve can be tailored to deliver optimal performance in any scenario.
The Stafsjö HG Knife Gate Valve is an advanced and reliable solution for industries requiring high-performance valves capable of managing challenging media. Its through-going design, superior flow characteristics, and robust sealing mechanisms ensure reliable, bi-directional zero-leakage shut-off in the most demanding environments.
With its modular construction, customizable materials, and ease of maintenance, the HG valve provides exceptional versatility and long-term efficiency. Whether in pulp and paper processing, mining, or any application involving abrasive or highly concentrated media, the HG stands as a dependable and innovative solution, delivering precision, durability, and peace of mind.
At Valve & Connector Technology N.V., you will find a wide range of high-quality industrial valves and quick couplings from leading brands such as EBRO ARMATUREN, STAFSJÖ VALVES, Walther-Präzision, and more.
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