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Introduction to structural classification of check valves

Release Date: October 04, 2019

According to the structure of the check valve, it can be divided into three types: lift check valve , swing check valve and butterfly check valve. Lift check valve can be divided into vertical and horizontal. Swing check valve is divided into three types: single, double and multi-lobe. The butterfly check valve is straight through. The above check valves can be divided into three types: screw connection, flange connection and welding. The structure of the lifting check valve is generally similar to that of the stop valve. The valve flap moves up and down along the channel in a line, which is reliable in motion, but has a large fluid resistance, which is suitable for light and small caliber applications. Lift check valve can be straight and vertical. Straight-through lifting check valve solenoid valve can only be installed in horizontal pipelines, while vertical lifting check valve is generally installed in vertical pipelines. The flap of the swing check valve rotates around the shaft. Rotary check valve can be divided into three types of single-turn, double-turn and multi-turn according to the number of flaps. Single flap swing check valve is generally suitable for medium-caliber applications. In order to reduce the water hammer pressure when using a single flap swing check valve for large diameter pipelines, a slow-closing check valve capable of reducing the water hammer pressure is used. Double flap swing check valve is suitable for large and medium diameter pipelines. Wafer double flap swing check valve has a small structure and light weight, and is a fast-growing check valve. Multi-flap swing check valve is suitable for large diameter pipelines. The structure of butterfly check valve is similar to butterfly valve. Its structure is simple, flow resistance is small, and water hammer pressure is also small.