The check valve means opening and closing member is a circular valve flap and produce its own weight and by the operation of the medium pressure to a valve block of the flow reversal. It is automatic valves, also known as check valve, check valve, a return valve or an isolation valve. Flap and lift motion is divided into swing. Similar check valves and shut-off valve lift structure, lacking only the stem drive the flap. Medium from the inlet end (lower side) of the inflow and outflow from the outlet end (upper side). When the inlet pressure is greater than the weight of the flap and the sum of the flow resistance when the valve is opened. Conversely, when the medium back valve is closed. A swing check valve and can be tilted about an axis of rotation of the flap valve, lift check valves and working principle is similar. Bottom check valve is often used as pumping means, can prevent backflow of water. A retaining off valve in combination with the use, can be as a safety isolation. The disadvantage is resistance, poor sealing when closed. Pressure
1. The check valve works
The check valve may also be used to provide supplies of which may rise over assistance system pressure pipeline system. The check valve can be divided into for swing (rotation by gravity) and lift check valves (axial movement).
This type of valve is a check valveAction door allows media to flow in only one direction and prevent flow in the opposite direction. This valve works automatically, under fluid pressure acting in a direction of the flow, the valve flap open; fluid flow the opposite direction from the fluid pressure and the valve flap from the coincidence flap acting on the valve seat to cut off flow.
which belongs to this type of check valves, swing check valves comprising a check valve, and lift. Swing check valves have ordinary hinge mechanism, the valve seat surface of the door as well as a free flap valve leaning tilt. To ensure that each valve flap reach the appropriate position of the seat surface, the valve design in the hinge mechanism, so that the valve flap has enough swing space, and a real flap valve, comprehensive engagement with the valve seat. Disc can be made of metal, it may be embedded in the leather, rubber metal, or synthetic coverage, depending on performance requirements. Swing check valve in the fully open position, fluid pressure is almost unimpeded, pressure drop through the valve is relatively small. Lift check valve flap is located on the valve seat body sealing surface. In addition to this valve flap is free to lift, as the rest of the cut-off valve, the fluid pressure causes the valve flap is lifted from the valve seat sealing surface, the medium return valve flap down onto the seat and cut off the flow. Depending on the conditions, the valve can be all metal configuration, or may be embedded in the form of a rubber mat or rubber ring in the valve flap frame. As cut-off valves, fluid channels through the lift valve is narrow, and therefore drop than the swing check valve by pressure bigger lift valve, swing check valves and the flow restrictions imposed very little.
2. The check valve Category
opening and closing member by the force of the flowing medium to turn itself on or off, in order to prevent the media back valve called a check valve. Check valves are automatic valves, primarily for one-way flow of the medium the pipeline, allowing media to flow in only one direction to prevent accidents.