| 摘要 |
<p>The partial-vacuum regulating valve consists of a main valve and an auxiliary valve. The auxiliary-valve body is adjusted in accordance with the partial vacuum prevailing in the milking system and affects the amount of air drawn out of the main-valve control chamber, which communicates with the atmosphere through a calibrated bore, through a certain channel. The partial vacuum that adjusts in the control chamber in accordance with the amount of air drawn out determines the position of the auxiliary-valve body and hence the amount of air flowing into a certain line through the air-inlet opening, which affects the partial pressure in the line. The main-valve control chamber has an additional calibrated air inlet that is closed off with a cap. When the cap is removed, atmospheric air also flows through the additional inlet into the main-valve control chamber and reduces the partial vacuum therein. The associated descent of the valve body reduces the air admitted into the line and hence leads to partial pressure in the milking system that is lower than the partial pressure established for the milking process by means of a screw and a spring.</p> |
