Slide Gate Valve

About this part

Slide gate valves (or isolation valves) for flue gas, air, and pulverized coal pipelines can be widely used for reliable isolation of various media in boiler flue gas, air, and pulverized coal systems. They can be used with equipment such as forced draft fans, primary air fans, booster fans, coal mills, and induced draft fans, allowing for online isolation and maintenance while the boiler is in operation. This product is reliable, easy to operate, and provides a tight seal, solving the common problems of incomplete closure and unstable operation of traditional slide gate valves. This simplifies equipment switching and shutdown maintenance, and is currently widely used in major power plants and steel mills worldwide.

Technical Features of Slide Gate Valves

• Depending on your site conditions, it can be installed and used in horizontal, vertical, inclined, and upright positions.
• The opening, closing, and locking of the slide gate valve are interlocked, facilitating centralized computer control. For ease of maintenance and special needs, manual control is also available on-site.
• The entire equipment undergoes heat treatment, ensuring no deformation under large temperature differences. It adopts a novel sealing structure and sealing materials, providing good sealing performance and high wear resistance.
• The operating mechanism is safe and fast, reliably completing all actions. This reduces dust accumulation on the guide rails during use, lowering the failure rate and reducing maintenance costs and labor intensity for maintenance personnel.
• Slide gate valves can be controlled by electric, pneumatic, hydraulic, or manual means.

Structure and Performance of the Slide Gate Valve

The slide gate valve (or slide valve) mainly consists of a valve frame, valve seat, valve plate, locking device, sealing system, opening and closing mechanism, and pulse ash removal system. Both the valve seat and valve plate adopt a cavity structure, and are precision machined after overall heat treatment to ensure that the equipment is free from thermal deformation. A special sealing device ensures no internal leakage between the valve plate and the valve seat, and no external leakage at the shaft journal, thus achieving true zero leakage.

Actuator

The opening and closing drive mechanism and locking mechanism of the slide gate valve are designed as an integrated unit. The slide gate valve is supplied with a local control box, allowing for both local and remote operation control.

Corrosion Protection

Depending on the site conditions and requirements, the parts of the slide gate valve that come into contact with flue gas can be lined with anti-corrosion materials to ensure that the slide gate valve is not corroded by flue gas and to guarantee its lifespan. Suitable anti-corrosion materials include 304, 316L, and 2205 stainless steel.

Hollow Composite Structure Valve Plate

The valve plate of the slide gate valve is assembled from two panels and a central support, followed by overall annealing treatment to completely overcome the stress caused by thermal deformation. The sealing surfaces of the valve plate and valve seat are then machined to ensure high flatness and a tight, leak-free seal.

Technical Parameters of the Slide Gate Valve

• Model: CBM-A(length)*B(width)*H(height) Note: A*B can be a rectangular, circular, or other shape of duct, determined by the user. H, the thickness of the slide gate valve, is generally 500mm.
• Medium: Cold and hot air, flue gas
• Design Temperature: ≤600 degrees Celsius
• Design Pressure: ≤1.0MPa
• Voltage: AC 380V/50Hz

Installation Instructions for Slide Gate Valves

• The flue and air ducts should be welded to the inlet and outlet flanges; direct welding to the valve body is not recommended.
• If the medium contains dust, compressed air at a pressure of at least 1 bar must be connected to the pre-reserved connector on the valve body.
• The support and suspension method of the slide gate valve body is the responsibility of the customer.
• The slide gate valve body is fully adjusted at the factory; do not disassemble it yourself.

Note: If the slide gate valve is equipped with a locking actuator, when closing, the slide gate valve must be fully closed before locking; when opening, the locking actuator must be released first before activating the opening/closing actuator.

Ordering Information for Slide Gate Valves

• Provide the flue duct cross-sectional dimensions (inner diameter) and wall thickness.
• Installation method: horizontal or vertical installation. If the airflow in the pipe is flowing up or down, the valve body should be installed horizontally; if the airflow in the pipe is flowing horizontally, the valve body should be installed vertically.
• Slide gate valve opening/closing type: electric, manual, or pneumatic.
• Huaneng Auxiliary Equipment Company can also provide pneumatic, hydraulic, chain drive, and manual transmission options for users to choose from.
• Provide the name of the medium, pressure, and temperature, and indicate whether or not there is fly ash.

Scope of Supply

• Slide gate valve body

(2) Actuator

• Counter flanges and fasteners for the interfaces on both sides of the slide gate valve body

Quality documentation included

• Dimensional inspection report (CMM / profile projector) for critical features
• Material certificate with heat number traceability
• Surface finish and hardness records where specified
• Photographic packing record before shipment

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