Slide Gate Valves

Slide Gate Valves

Rieco’s Slide Gate Valve is a versatile and reliable equipment specifically designed to seamlessly fit into systems handling dry bulk materials. It is designed to highest safety standards of operators and technicians. The slide plate of the valve, being the critical component that interacts directly with the material flow, is thoughtfully designed to remain unexposed.

Furthermore, this knife gate valve plays a critical role in industries where solid, granular, or powdered pellet materials need to be reliably discharged from silos, bins, cyclones, or hoppers, under positive or negative pressure conditions. Whether it is in the rigorous environment of a flour mill, the demanding landscape of a cement plant, or the precise operations of a pharmaceutical facility, Rieco's Slide Gate Valve proves to be an indispensable asset, delivering unparalleled control and reliability where it matters most.

With Rieco's Slide Gate Valve, you are not only investing in a high-quality, durable piece of equipment but also in an immanently safe and efficient solution for your bulk material handling needs.

Operation of Slide Gate Valves

A slide gate valve operates through a simple yet effective mechanism that is designed to control the flow of dry bulk materials. Here's how it works

  • Slide Plate Movement At the core of the valve is a rectangular stainless steel slide plate. This plate is the primary component responsible for either allowing or halting the flow of material.
  • Polymer Plate Compression The valve is designed with two hard polymer plates, which are compressed together. These plates serve as the guides and sealing surfaces for the slide plate.
  • Opening and Closing Action To operate the valve, the stainless steel slide plate moves (or 'slides') between these two compressed polymer plates. Moving the slide plate in one direction opens the valve, allowing material to pass, while moving it in the opposite direction closes the valve, stopping the material flow.
  • Sealed Closure In the closed position, the two hard polymer plates hold the stainless steel slide plate tightly. This secure hold prevents both the conveying air and the materials from escaping through the valve, ensuring a tight and effective seal.
  • Self-Cleaning Mechanism One of the standout features of this slide gate valve is its self-cleaning ability. As the slide plate moves to and fro between the polymer plates during operation, it effectively cleans off any residual material that may have adhered to it. This ensures that the valve remains free of material buildup and operates smoothly over time.
    In summary, the operation of the slide gate valve involves the movement of a stainless steel slide plate between two compressed polymer plates, enabling precise control of material flow with a reliable sealing mechanism when closed, and a self-cleaning action with every stroke.


Electro pneumatic double flap valve

An electro-pneumatic double flap valve is a variation of the double flap valve that incorporates an electro-pneumatic actuation mechanism. This type of valve combines electrical control with pneumatic power to operate the flaps and regulate the flow of fluids or gases. Here's how it generally works:

  • Actuation Mechanism: An electro-pneumatic double flap valve utilizes an actuator that converts electrical signals into pneumatic pressure. The actuator is typically a solenoid valve or an electric motor-driven mechanism that controls the flow of compressed air or gas to operate the flaps.
  • Control System: The valve is connected to a control system, such as a programmable logic controller (PLC) or a dedicated control unit. The control system receives input signals, such as pressure, flow rate, or timing, and sends corresponding electrical signals to the actuator.
  • Flap Operation: When the electrical signal is received, the actuator adjusts the pneumatic pressure, which in turn operates the flaps of the double flap valve. Depending on the control signal, the flaps can be opened, closed, or positioned at specific angles to regulate the flow as required.
  • Feedback and Monitoring: Some electro-pneumatic double flap valves incorporate sensors or feedback mechanisms to provide information about the position of the flaps. This feedback allows the control system to monitor the valve's status, detect any malfunctions, or provide data for process control.
Motorised double flap valve

A motorized double flap valve is a type of valve that utilizes a motorized actuator to control the opening and closing of the flaps. It combines mechanical motion with an electric motor to regulate the flow of fluids or gases. Here's how a motorized double flap valve generally operates:

  • Actuation Mechanism: The valve is equipped with an electric motor-driven actuator that is connected to the flaps. The actuator consists of a motor, gears, and linkage mechanisms that translate the rotary motion of the motor into the linear motion required to open or close the flaps.
  • Control System: The actuator is controlled by an electrical control system, such as a control panel or a programmable logic controller (PLC). The control system receives input signals, such as manual control inputs, process parameters, or signals from sensors, and sends corresponding commands to the actuator.
  • Flap Operation: When the control system sends a command to the actuator, the motor rotates, transmitting the motion through the gears and linkages to the flaps. The flaps are then opened or closed based on the desired flow conditions. The motorized actuation provides precise control over the position and movement of the flaps.
  • Feedback and Monitoring: Some motorized double flap valves incorporate sensors or feedback mechanisms to provide information about the position of the flaps. This feedback allows the control system to monitor the valve's status, verify proper operation, and enable closed-loop control if necessary.
Counterbalance double flap valve

A counterbalance double flap valve is a specific type of double flap valve that incorporates a counterbalancing mechanism to assist in the operation of the flaps. The counterbalance mechanism helps to reduce the effort required to open and close the flaps, particularly in situations with high flow rates or pressure differentials. Here's how a counterbalance double flap valve typically functions:

  • Flap and Hinge Design: The valve consists of two flaps that are hinged at the top or side of the valve body. The flaps are typically made of a flexible material like rubber or elastomer to provide a tight seal when closed.
  • Counterbalance Mechanism: The counterbalance mechanism is integrated into the valve to offset the weight of the flaps and assist in their movement. It typically involves the use of weights or springs that are connected to the flaps and provide a counteracting force.
  • Opening and Closing: When the fluid or gas flow begins to exert pressure on the flaps, the counterbalance mechanism helps to reduce the resistance and facilitates the opening of the flaps. As the flow subsides or reverses, the counterbalance mechanism assists in closing the flaps smoothly and effectively.
  • Flow Control: The position of the flaps in a counterbalance double flap valve can be adjusted to control the flow rate. By altering the tension or force applied by the counterbalance mechanism, the degree of flap opening can be regulated, allowing for fine-tuning of the flow control.


  • Compact Design: Designed with a minimum flange-to-flange height, this slide gate valve is optimized to require minimal installation space.
  • Versatile Installation: Ideal for both new installations and retrofitting existing systems, offering seamless integration into various setups.
  • Selectable Materials for Free Flow Control: Users can specify the sliding knife and seal materials, ensuring free and smooth flow control of bulk solids according to specific needs.
  • Variety of Flange Options: Available with both square and circular inlet/outlet flanges, providing flexibility to suit different installation requirements.
  • Replaceable Seals for Zero Leakage: Features replaceable polyurethane, gland packing, and silicone seals. These components ensure continuous performance without material leakage.
  • Diverse Construction Options: Depending on application requirements, options include cast steel, cast aluminium, and welded steel construction slide gate valves.
  • Custom Design Availability: Custom-designed slide gate valve models are available to meet unique application needs. For food and sanitary applications, stainless steel models are offered, while abrasive bulk solids applications can opt for Hardox steel models.
  • Position Indicators for Remote Monitoring: Equipped with position indicators that allow operators to easily ascertain the valve's position from a distance, enhancing operational safety and efficiency.

Rieco’s Slide Gate Valve is expertly designed to manage and control a diverse spectrum of materials, whether in powdered, granular, or aggregate forms. This includes, but is not limited to:

With Rieco's Slide Gate Valve, precise, reliable, and efficient handling of materials is assured, regardless of the industry or application, ensuring the integrity of both the materials and the process flow.

Why Rieco?

As your global partner, we fully immerse ourselves
in your process challenges.
48 +
Years of Experience
40 +
6000 +
Successful Installations
300 +
Strong Team
5 +
Global Partnerships
Manufacturing Facilities
Global Presence
We’re there for you
West Indies
United Kingdom
Saudi Arabia
Sri Lanka
Feel free to ask us anything you have in mind,
we are happy to answer
Enquire Now
Back to Top
Enquire Now

Enquire Now