Freezing preventing and water hammer preventing combined type high-speed air relief/inlet valve

Abstract

The invention discloses a freezing preventing and water hammer preventing combined type high-speed air relief / inlet valve. The air relief / inlet valve is provided with a valve body, a valve cover, a floating ball, a floating ball cover, a lifting cover and an air relief cover. The air relief / inlet valve is characterized in that a large-capacity annular air cavity is arranged at the periphery of the air relief valve, so that when water hammer impact waves produced at the downstream are transferred into the valve, the impact waves are easily compressed and absorbed by air which is an elastomer and accordingly are eliminated; and besides, the annular cavity is equal to a heat preserving and insulating layer, so that the icing of water in an inner cavity can be effectively prevented. A plurality of freezing preventing or eliminating means are further adopted, the reliable work of an air relief hole can be ensured, and the action of the lifting cover can be effectively prevented from being affected by freezing.

Description

technical field [0001] The invention relates to an intake and exhaust valve, in particular to an anti-freezing and water-hammer composite high-speed exhaust and intake valve. Background technique [0002] In order to improve water delivery efficiency and prevent water delivery pipelines from being damaged due to negative pressure, composite high-speed exhaust and intake valves (hereinafter referred to as exhaust valves) are widely used on water delivery pipelines. Its main function is: when the water is supplied for the first time, a large amount of air will be exhausted quickly through the large air vent, and after the rapid exhaust, the large air vent will be closed; Raising or lowering, the exhaust is repeatedly exhausted through the small exhaust hole; when there is negative pressure in the water pipeline, such as power failure or maintenance and water stoppage, the large exhaust hole opens quickly, and the outside air enters the pipeline through the exhaust valve, elimi...

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Problems solved by technology

CN200420103028X patent discloses a kind of exhaust valve which is widely used at present and has been listed as a typical structure by the national standard. It is full of water, so the anti-hammer ability is poor. When the shut-off valve behind the valve is quickly closed or the large vent hole of the first water supply is quickly closed to generate water hammer, it is easy to cause damage to weak parts such as floating balls; in addition, it cannot be used in severe cold areas. Otherwise, the valve body and other parts will be broken due to freezing and expansion of water; 2) The transported water will inevitably contain trace impurities, which will inevitably accumulate in the valve after a long period of use, causing the exhaust valve to leak or the small exhaust hole to be blocked. troublesome, time-consuming

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