"Honeywell (Honeywell) Valve" HC41X muffler valve and its role is to prevent the line of medium back. Pump water off the end of the valve also belongs to check class. Opening and closing pieces by medium flow and the forces to open or close the valve to prevent the media called the check back. Check valves are automatic valves, mainly for one-way flow of media channels, only allowing media to flow in one direction, to prevent accidents. Check valve according to the structure can be divided into lift check valve, swing check valve and butterfly valve of three. Lift check valve can be divided into two kinds of vertical and horizontal. Swing Check into unicuspid type, double valve type and Orange Peel three. Butterfly valve for the straight-through, the above check valve in the connection of several forms can be divided into threaded connection, flange connection and welding of three. Check valve is to automatically prevent fluid backflow valve. Check valves in the fluid under pressure valve opens, fluid flows from the inlet side of the exit side. When the import side, the pressure is lower than the export side, the valve flap in the fluid pressure, the role of such factors as gravity itself automatically close to prevent fluid backflow. Check valve is generally divided into lift, swing, butterfly and diaphragm and other types. Lift check valve structure generally similar to the disc along the channel to line up or down movement, and reliability, but the fluid resistance is greater for small-caliber light situations. Lift check valve can be both straight-through and vertical. Straight-through lift check valve generally only be installed in horizontal pipeline, the vertical lift check valve installed in a vertical line on the general. Swing check valve disc rotates around the shaft. The fluid resistance is generally less than lift check valve, which applies to the larger diameter of the occasion. Swing check valve according to the number can be divided into ill with Swing, Swing, and double valve Swing Orange Peel three. Ill with swing check valves are generally applicable to medium-caliber occasions. Large-diameter pipe used ill with swing check valve, in order to reduce water hammer pressure, the best use can reduce the water hammer pressure relief valve closed. Double disc swing check valve for medium and large diameter pipeline. Wafer double disc swing check valve structure is small, light weight, is a rapid development of the valve; Orange Peel swing check valves for large diameter pipe. Butterfly valve butterfly valve like structure. Its simple structure, small flow resistance, low water hammer pressures. Diaphragm valve has a variety of structural forms are used divide as the opening and closing parts, water hammer due to its good performance, simple structure, low cost, rapid development in recent years. However, the use of diaphragm valve temperature and pressure by the diaphragm material constraints.