JPH0446276U - - Google Patents

Description

[Brief explanation of drawings]

1 and 2 are cross-sectional views showing an embodiment of the metering valve of the present invention. FIG. 1 shows the standby state, FIG. 2 shows the liquid discharge completed state, and FIGS. 3 A and B.
, C is an enlarged sectional view showing the operating state of the main plunger and the auxiliary plunger in the metering valve of the present invention, FIG. 4 is a system diagram showing a liquid metering supply system using the metering valve of the present invention, and FIGS. Figure 6 is a sectional view showing other embodiments of the metering valve of the present invention, Figures 7 and 8 are sectional views showing conventional metering valves, Figure 7 is a standby state, and Figure 8 is a liquid metering valve. It is a figure which shows the completion state of discharge, respectively. In the figure, 1 is the valve body, 2 is the upper valve body, 3 is the middle valve body, 4 is the lower valve body, 5 is the air cylinder, 6 is the air piston, 8 is the main plunger, 9 is the communication hole,
9a is an end opening, 9b is a peripheral opening, 11 is a spring, 13 is an air inlet/outlet, 15 is a liquid inlet, 16 is a liquid cylinder, 19 is an auxiliary plunger,
19a is a convex portion, 22 is a spring, 23 is a liquid outlet passage, 24 is a liquid discharge passage, 26 is a check valve, 2
7 is a ball, 32 is a needle, 35 is an adjustment knob,
52 is an adjustment screw, and 53 is a nut.

Claims (1)

[Claims for Utility Model Registration] 1. An air cylinder communicating with an air inlet and outlet is formed within the valve body, and an air piston is disposed within the air cylinder so as to be movable reciprocally by the biasing force of a spring and air pressure, The other end of a main plunger having a communication hole opened in one end surface and opened in a circumferential surface remote from the one end surface is engaged with the air piston, and the end surface opening of the communication hole of the main plunger has a diameter smaller than that of the main plunger. An auxiliary plunger having a protrusion formed on one end surface so as to be fluid-tightly joined to the main plunger is disposed within the valve body, and the end surface opening of the communication hole of the main plunger and the protrusion on the one end face coaxially oppose each other, and the spring is attached to the auxiliary plunger. A liquid inlet is provided in the valve body so as to be slidable against force, and is provided in the main plunger with a liquid inlet that constantly communicates with the peripheral opening of the communication hole of the main plunger, and a liquid inlet of the main plunger is provided in the opposing portion of the main plunger and the auxiliary plunger. A liquid cylinder communicating with the liquid inlet via a communication hole and having an auxiliary plunger provided therein is formed in the valve body, and a liquid discharge passage communicating with the liquid cylinder is further provided in the valve body. Metering valve. 2. The metering valve according to claim 1, further comprising a check valve disposed between the liquid cylinder and the liquid discharge passage. 3. The metering valve according to claim 1 or 2, characterized in that the valve body is provided with an adjustment tool for adjusting the amount of movement of the main plunger.