Swing check pneumatic valve structure improvement

as pneumatic valve downstream piping system open the pneumatic valve is closed, the reflux is mainly used to prevent the backflow medium, to prevent the pump and drive motor reverse discharge medium container; By far the most commonly used pneumatic valve needle swings around check pneumatic valve pneumatic valve moves along the vertical center line of pneumatic valve lift check valve, but faster than the backflow medium pneumatic valve from the highest velocity structure is zero, the entrance to the end of the pipe caused by the rapid increase of the internal pressure of the German standard by the pneumatic valve, so have a devastating effect and pipe system of water hammer, so usually check the pneumatic valve production? Mm diameter (). Pneumatic valve in order to reduce the effect of water hammer, expand the check pneumatic valve, Angle type by the pneumatic valve using the original product design, additional vice slow breath valve, pneumatic valve, corrugated pipe cut-off, on the basis of water hammer steps to solve the problem of the pipe.
a swing check
the modification of the pneumatic valve structure test unit as shown. With calibrated pressure gauge, pressure differential pressure transmitter signal will send time recording oscillograph calibration waveform good R read each value of the proportion of water hammer pressure. The overall structure is shown in figure, with a slowly-closing vice minister ( 2) One-way pneumatic valve ( 一) Pneumatic valve and check the general structure comparison test results.
lift check
the modification of the pneumatic valve structure, national standard pneumatic valves;
the aerodynamic lift check valve, hand moving valve also know, it is required to maintain the pumping stations, water column (pump, the structure of the pneumatic valve to improve the characteristics of the pneumatic valve is in the main plate between the pneumatic valve deputy another slow breath valve bracket, as shown in figure. Figure (
一) Unowned pneumatic valve slow breath valve of vice as a result, the largest water hammer. Mpa; Figure ( b） Pneumatic valve by pneumatic valve and the main relief when vice as a result, the biggest increase. Mpa water hammer.
( ） Enabled and close the pneumatic valve, pneumatic valve slowly-closing vice is compact, reliable in performance. （ ） Main pneumatic valve fast first slowly-closing after close the pneumatic valve, which can effectively prevent destructive water hammer, stainless steel by the pneumatic valve, pneumatic valve, check used to expand. （ ） Improve the simple structure, easy production and exchange. （ ） Slow breath valve may repair or replace, check pneumatic valve use shall not be affected.

test mm diameter pneumatic valve, pneumatic valve, flange for the system pressure. MPa, flow liters per second when the pump stops suddenly, show that the power outage, close the inlet side pressure pneumatic valve - Time curve ().
slowly-closing check pneumatic valve check with pneumatic valve in general structure improves the problem of water hammer, closely affiliated company additional pressure pneumatic valve designed to improve the smooth opening and closing ceremonies of the products, to reduce the water hammer pressure. Keywords: one-way pneumatic valve, low temperature by the pneumatic valve, hydraulic slowly-closing,
body structure and an additional pads at the end of the ring network interconnection, in addition to the increase of the height of intervertebral disc; Buffer and buffer rubber seals, pneumatic valve shaft and piston rigid connection, the smaller the gap between the buffer tank pneumatic valve shaft cylinder piston. When the downstream of the medium, the opening pressure medium into the pneumatic valve cavity body, at the same time push the piston up buffer, when the medium flow back, pneumatic valve, welding opens, due to internal buffer tank media fully, buffer tank and small pneumatic valve, so with the press of the buffer tank's gap is gradually by axial gap, the main pneumatic valve, pneumatic valve pad makes network control water hammer pressure
in the original swing check pneumatic valve in the add a pair of pneumatic valve ( Figure) Slowly-closing, cast iron pneumatic valve. Pair of pneumatic valve and lower side or both sides main pneumatic disc mounting screw connection, media normal flow pneumatic valve opens, media pressure pneumatic valve opened the vice, medium flows through the main pneumatic valve, drainage holes of pneumatic valve, pneumatic valve, oxygen makes imports by the end of the main pressure pneumatic valve, pneumatic valve is opened, the main into balance before and after the main pneumatic valve pressure; Upstream medium, in the role of reverse flow quickly close main pneumatic disc media, pneumatic buffer tank body, deputy vice pneumatic valve pneumatic valve cover the cover screw in upper pneumatic valve has a small hole, deputy pneumatic valve plate and piston rod piston has a buffer tank, and some air gap between the rubber type O sealing ring, the bottom of the piston between the pneumatic valve, sealing surface; When the main pneumatic valve and pneumatic disc close associate, pneumatic valve cover as the role of the hole, the media are increasingly through the hole in the buffer tank into the vice of pneumatic valve chamber, through the pneumatic valve and piston rod, the agent after the gap between the part of the media, it is slow, deputy pneumatic valve piston closed. This structure is equivalent to quickly shut down the main pneumatic valve closing phase, slowly close to the deputy slowly-closing equivalent to pneumatic valve, hydraulic and mechanical foundation beam pumping unit show that the transition mechanism of structural design can effectively prevent water hammer.