JPS5921170U - butterfly valve - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本考案実施の一例を示すもので、第１図は第２図
Ｉ−Ｉで切断した断面図、第２図は第１゛図■−■で切
断した断面図、第３図は第１図の右側面図である。 １は箱体、３はバタフライ弁体、６．　６’は通水孔、
７．７′は弁座、９は圧力逃がし弁である。The drawings show an example of the implementation of the present invention. Fig. 1 is a sectional view taken along the line I-I in Fig. 2, Fig. 2 is a sectional view taken along the line I-I in Fig. 1, and Fig. 3 is a sectional view taken along the line FIG. 1 is a right side view of FIG. 1 is a box body, 3 is a butterfly valve body, 6. 6' is a water hole,
7.7' is a valve seat, and 9 is a pressure relief valve.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 弁体にその上流側及び下流側を連通ずる通水孔を設け、
前記弁体が少なくとも全閉状態の時は前記通水孔を閉塞
状態に保ち且つ前記弁体が開放状態から閉塞状態になる
のに伴ない発生する背圧が少なくともウォータハンマー
を発生し得る値になった時その背圧の作用で前記通水孔
を開放し得る如く作動される圧力逃がし弁を設けてなる
バタフライ弁。A water hole is provided in the valve body to communicate the upstream and downstream sides thereof,
The water passage hole is maintained in a closed state when the valve body is at least fully closed, and the back pressure generated as the valve body changes from an open state to a closed state is at least at a value that can generate water hammer. The butterfly valve is provided with a pressure relief valve that is operated so as to open the water passage hole by the action of the back pressure when the water is released.