1- Gate valve and mechanical corrosion
- In the system, the fluid contains particles following the flow, causing impact, rubbing against the surface of the valve parts. This takes place for a long time in valve operation causing corrosion.
- The particles break the metal structure that makes up the valve parts, causing pitting and metal flaking on the surface of the details. Over long operating time, repeating the above phenomenon causes abrasion, affecting the service life and working ability of the valve.
- In addition, under the pressure of the fluid flow, the fluid molecules also impact on the hard assembly surface of the valve seat and gate in the closed state. Over time, the phenomenon is repeated many times causing surface abrasion, causing relative position deviation between the valve gate and the valve seat surface, and at the same time the valve compression spring is weakened by deformation due to wear. and the guide pipes of the valve seat are also worn, the inner diameter oval makes the valve working no longer perpendicular to the mounting surface of the valve seat surface, resulting in a bent valve base and tearing of the seal packing. .
2-Remedy and improve efficiency in use for gate valves
- Welding fill in the abraded location
- Separating and filtering impurities before the fluid passes through the valve
- Using chemical and electronic measures to prevent deposition of paraffin
- Using sacrificial metal
- Selection of valve suitable for each use position
- Strictly comply with the regulations on operation, periodical repair and maintenance.
3-Advantages of gate valves
High working capacity
- Saving space due to short valve body structure length.
- The opening / closing operation consumes less energy because the movement direction of the valve is perpendicular to the fluid flow.
- The resistance to liquid is small because of the straight gate valve body structure, fluid flow through the valve is not diverted.
Operate the valve slowly opening and closing so it reduces the vibration of the system, less impact on the system.
- Low opening / closing torque.
Wide range of applications
4-Disadvantages of gate valves
- This type of valve is not recommended for flow regulation.
- The external size is quite large, requires large space for installation and operation.
- The seal surface is easily damaged when opening / closing due to friction of the valve seat and disc.
Complex structure, high repair cost and also difficult.
Dai Nam is a genuine distributor of industrial pumps and valves. We also have a team of skilled technicians, knowledgeable about industrial pumps and valves that always know how to install, operate properly and fix them when problems occur. Please contact us for a free consultation
