JPH02112995U

JPH02112995U -

Info

Publication number: JPH02112995U
Application number: JP1896889U
Authority: JP
Priority date: 1989-02-22
Filing date: 1989-02-22
Publication date: 1990-09-10

Description

[Brief explanation of drawings]

第１図は本考案の一実施例を示す要部の断面図
、第２図は本考案による自動給水装置の性能曲線
図、第３図は従来の減圧弁の正常水量時の状態を
示す縦断面図、第４図ａは同減圧弁の小水量時の
状態を示す縦断面図、第４図ｂは同図ａの要部断
面側面図、第５図は従来の装置の性能曲線図であ
る。１……減圧弁本体、２……内部弁体、２ａ……
スロツトル弁、１１……通路、１２……逆止弁キ
ヤツプ、１３……逆止弁体、１４……小穴、１５
……ニードル弁。 Fig. 1 is a sectional view of the main parts showing an embodiment of the present invention, Fig. 2 is a performance curve diagram of the automatic water supply device according to the invention, and Fig. 3 is a longitudinal section showing the state of a conventional pressure reducing valve at normal water flow. Figure 4a is a vertical sectional view showing the state of the pressure reducing valve at a small water flow, Figure 4b is a sectional side view of the main part of Figure a, and Figure 5 is a performance curve diagram of the conventional device. be. 1... Pressure reducing valve body, 2... Internal valve body, 2a...
Throttle valve, 11... Passage, 12... Check valve cap, 13... Check valve body, 14... Small hole, 15
...Needle valve.

Claims

[Scope of Claim for Utility Model Registration] 1. In an automatic water supply device equipped with a control valve (hereinafter referred to as a pressure reducing valve) on the discharge side of a pump that controls the discharge pressure to a constant level, the degree of pressure increase of the pressure reducing valve when the amount of water is small is changed. An airlock prevention device for an automatic water supply device, characterized in that a valve is provided in a passage communicating between an inlet side and an outlet side of the pressure reducing valve to eliminate aerodynamics that occur when a pump operates with a small amount of water. 2. In an automatic water supply device equipped with a control valve (hereinafter referred to as a pressure reducing valve) on the discharge side of the pump that controls the discharge pressure at a constant level, a passage provided with a check valve that communicates the inlet and outlet sides of the pressure reducing valve is The automatic water supply is characterized in that the passage cross-sectional area of the provided small hole is adjusted by a needle valve, and the minimum operating water amount for each pump that does not generate airflow can be arbitrarily set to eliminate airflow. Equipment airlock prevention device.