Tianjin KXC Metal Products Co., Ltd.

What is a Check valve? A check valve   is typically installed in a pipeline to prevent backflow. A check valve is basically a one-way valve in which fluid can flow freely in one direction, but if the flow is diverted the valve will close to protect the pipeline, other valves, pumps etc. Water hammer can occur if the flow is diverted and no check valve is fitted. Water hammer often occurs with great force and can easily damage pipework or components. Types of check valves There are several types of check valves   available for water and waste water applications. They work in different ways but serve the same purpose. AVK offers a wide range of swing check valves, ball check valves, tilting disc check valves, tilt seat check valves, nozzle check valves and silent check valves. The most common types of water and waste water check valves are swing check valves and ball check valves. Swing check valves: Swing check valves are fitted with a disc that swings on a hinge or shaft. The ...

Resilient Sealed Butterfly Valves vs. Metal Sealed Butterfly Valves For metal-seated butterfly valves, both sealing surfaces of the valve are metal materials or other hard materials that do not seal well, but have good mechanical properties, such as high temperature resistance and resistance to wear. While one sealing surface of resilient seat butterfly valve is metal material, and the other sealing surface is non-metallic resilient material. The resilient seat has good sealing performance, but has poor mechanical properties, such as not high temperature resistance and easy wear. Resilient seal butterfly valve  has good sealing performance and can reach zero leakage, but has poor thermal adaptability and short service life. Hard seal butterfly valve has bad sealing performance and can't reach zero leakage, although some manufacturers claim that their products can do it. Metal sealed butterfly valves can be used for some corrosive media, while resilient sealed butterfly valves canno...

Choosing the wrong type of valve can be detrimental to your operation. There are several different types of butterfly valves on the market, including high performance, resilient seat, and triple eccentric.   Offset in Butterfly Valves When looking at butterfly valves, the difference between high performance, resilient seat, and triple eccentric butterfly valves has to do with valve offset.    High Performance Butterfly Valves This popular valve is also known as a  high performance butterfly valve  or double offset butterfly valve. The valve has two off-centered stems. This creates a cam action during the application.   ◮1 ST Offset: The axis of the shaft is behind the centerline of the sealing point of the disc seat. ◮2 Second Offset: The axis of said shaft is eccentric to the center of the valve/tube line.   High performance butterfly valves are typically used in: power generation, pulp and paper, HVAC, chemical, oil and gas, water and wastewater trea...