One-way valve (One-way valve), also known as one-way valve or check valve, its role is to prevent the media back in the pipeline. Water pump off the bottom valve also belongs to the check valve category. Opening and closing parts by the media flow and strength to open or close their own to prevent media backflow valve called the check valve. Check valves are automatic valves, mainly used for medium flow of one-way pipe, only allow medium to flow in one direction to prevent accidents. The check valve is a valve that automatically stops fluid from flowing backwards. The check valve flap opens under fluid pressure and fluid flows from the inlet side to the outlet side. When the pressure on the inlet side is lower than on the outlet side, the valve flap closes automatically under the effect of fluid pressure difference and gravity itself to prevent fluid backflow. Check valve is generally divided into lift, swing Kai, butterfly and diaphragm type, and other several. Lift check valve structure is generally similar to the cut-off valve, the valve flap along the line for lifting movements, reliable action, but larger fluid resistance, suitable for light small caliber occasions. Lift check valve can be straight and vertical two. Straight-through lift check valve can only be installed in the horizontal pipe, and vertical lift check valve is generally installed in the vertical pipe. Swing check valve flap for rotation around the axis of rotation. The fluid resistance is generally less than the lift check valve, which is suitable for larger diameter occasions. Swing check valve according to the number of valves can be divided into single-valve swing type, double-swing type and multi-swing swing type three. Single-flap swing check valve is generally suitable for medium-diameter occasions. Selection of large-diameter pipe single swing check valve, in order to reduce water hammer pressure, it is best to reduce the pressure of the water hammer slow closing check valve. Double valve swing check valve for medium and large diameter pipe. Double-flap swing check valve on the structure of small, light weight, is a fast-growing check valve; multi-valve swing check valve for large-diameter pipe. Butterfly check valve structure similar to the butterfly valve. Its simple structure, smaller flow resistance, water hammer pressure is also smaller. Diaphragm check valve has a variety of structural forms, are used as the opening and closing the diaphragm, due to its good waterproof hammer, simple structure, low cost, rapid development in recent years. However, the use of diaphragm check valve temperature and pressure diaphragm material restrictions.
Lap Joint Flanges
Lap Joint Flanges (LJ Flanges) are used on piping fitted with lapped pipe or with lap joint stub ends the combined initial cost of the two items being approximately one-third higher than that of comparable Welding Neck Flanges.
Lap joint flange is having two components, a stub end, and a loose backing flange. Stub end is butt welded to the pipe and Backing flange freely move over the pipe. The backing flange can be of different material than stub material and normally of the carbon steel to save the cost. Lap flange is used where frequent dismantling is required, and space is constrained.
Furthermore, a standard lap joint flange will typically have a longer hub length in comparison to a slip on flange, but this is often considered unnecessary for many applications.
The lap joint flange is practically identical to a slip-on flange except it has a radius at the intersection of the bore and flange face.
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