Industrial processes require dependable components for complete flow isolation. The on-off valve serves this fundamental purpose, providing a secure shut-off function across various applications. Several valve types are engineered for this duty, each with distinct mechanical advantages. Manufacturers, including Neway Valve, supply a range of these critical components to meet different operational requirements.
Quarter-Turn Rotary Valves
This category includes valves that operate with a 90-degree turn. Ball valves, characterized by a rotating ball with a bore, offer tight sealing and minimal pressure drop. Plug valves function similarly with a cylindrical plug. Butterfly valves, using a rotating disc, provide a compact and cost-effective solution, especially in larger sizes. These designs are prevalent where rapid operation is necessary for an on and off valve function.
Linear Motion Valve Designs
Gate valves and globe valves represent this group. They utilize a stem that moves a closure element linearly into the flow path. A gate valve employs a wedge or gate that lifts completely out of the flow stream, resulting in very low flow resistance when open. A globe valve, with a plug seated against a ring, is also effective as an on-off valve, though it introduces a higher pressure drop due to its flow path.
Specialized Mechanism-Based Valves
Certain designs suit specific service conditions. Diaphragm valves use a flexible membrane to isolate the flow stream, making them suitable for slurries or corrosive fluids. Pinch valves operate by pinching a rubber sleeve, offering a full-port, drop-tight seal with no internal obstructions. The selection of these specialized types depends on the media characteristics and the required sealing reliability.
The diversity of on-off valve types allows for precise selection based on pressure, temperature, flow media, and sealing requirements. Each design presents a balance of sealing capability, pressure drop, and operational torque. For engineers specifying an on and off valve, the range of products from suppliers like Neway Valve provides tested solutions to ensure system integrity and operational safety during isolation duties.
