What Is a Constant Flow Valve?
A constant flow valve is a control valve designed to maintain a constant flow rate of fluid, even in the presence of pressure fluctuations. These valves eliminate the need for additional control devices, offering cost and space savings. They are typically easy to install and do not require a power supply, making them suitable for handling hazardous fluids safely.
Uses of Constant Flow Valves
Constant flow valves find applications in various sectors, including:
- Manufacturing industry for plant flow control.
- Chemical processes and food processing for consistent flow.
- Building air conditioning systems for temperature control.
- Thermal power plants and industrial furnaces for fuel supply regulation.
Principle of Constant Flow Valve
Constant flow valves regulate flow by adjusting the opening area in the pipeline. They typically have moving parts like discs or plates that generate resistance to control the flow rate. These valves can be part of a feedback control loop, using sensors to monitor and adjust the flow rate as needed.
Types of Constant Flow Valves
Different types of constant flow valves include:
1. Flow Washer Type
Uses a rubber flow washer with small holes to limit and adjust the flow path area.
2. Orifice Type
Employs an orifice plate to control fluid flow by altering the hole size.
3. Needle Type
Features a needle-like part for precise flow control, ideal for advanced control requirements.
4. Diaphragm Type
Uses a flexible diaphragm, typically made of durable materials like PTFE, for accurate flow control in various fluids and environments.
Constant flow valves are essential in industries where maintaining a consistent flow rate is crucial for efficiency and safety.