JPS60154673U - relief 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]

図面はこの考案の一実施例を示す断面図である。 １はリリーフ弁本体、１□はポンプポート、１２はドレ
ンポート、２は圧縮ばね、３はスプール、３ｂ、３ｄは
圧力室、６は小径ピストン、７は大径ピストン、１０は
切換え弁。The drawing is a sectional view showing an embodiment of this invention. 1 is a relief valve main body, 1□ is a pump port, 12 is a drain port, 2 is a compression spring, 3 is a spool, 3b and 3d are pressure chambers, 6 is a small diameter piston, 7 is a large diameter piston, and 10 is a switching valve.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] リリーフ弁本体１内に圧縮ばね２により一方向へ付勢さ
れたスプール３を設けて、ポンプポート１□とドレンポ
ート１□の間を開閉自在に遮断し、また上記スプール３
の圧縮ばね２と反対側の端部内に径の異なる複数個の小
径ピストン６及び大径ピストン７を、圧縮ばね２側端部
が圧力室３ｂ、３ｄに臨むように収容すると共に、小径
ピストン６の端部が臨む圧力室３ｂ内にポンプポート１
□の圧力を、そして大径ピストン７が臨む圧力室３ｃ内
に切換え弁１０を介してポンプポート１□側の圧力をそ
れぞれ導入してなるリリーフ弁。A spool 3 biased in one direction by a compression spring 2 is provided in the relief valve body 1 to freely open and close between the pump port 1 □ and the drain port 1 □.
A plurality of small-diameter pistons 6 and large-diameter pistons 7 having different diameters are accommodated in the end opposite to the compression spring 2 so that the end on the compression spring 2 side faces the pressure chambers 3b and 3d, and the small-diameter piston 6 Pump port 1 is located in pressure chamber 3b facing the end of
A relief valve that introduces the pressure of □ and the pressure of the pump port 1 □ side through the switching valve 10 into the pressure chamber 3c facing the large diameter piston 7.