JPH01156258U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a simple piping diagram showing the installation position of the product of the present invention. FIG. 2 is a front cross-sectional view showing a state in which water is flowing after the branch pipe when the product of the present invention is being supplied with water. FIG. 3 is a front sectional view showing the set pressure state when water is being supplied to the product of the present invention and no water is flowing beyond the branch pipe. FIG. 4 is a front sectional view showing the backflow prevention state when negative pressure is generated on the water supply pipe installation side during water supply of the product of the present invention. FIG. 5 is a front sectional view showing the water drained state of the product of the present invention.

Claims (1)

[Scope of utility model registration request] It has a water supply pipe attachment part (primary) 12 and a branch pipe attachment part (secondary) 13 on the side, and a horizontal drain pipe attachment part 14 at the bottom, and above the main body 11 that houses a piston 19 therein is an operation section. In particular, a bonnet 16 to which a handle 17 for supplying and draining water is screwed is fixed, a spring 20 is installed inside the piston 19 above it to give a constant downward force to the piston 19, and a branch pipe attachment part ( Diaphragm 2 which receives the pressure of secondary) 13 and gives upward force to the piston 19
3, inside the main body 11 there are cylinders 27, 28 having the same diameter in order from the top.
, a small diameter cylinder 29 is provided, and the cylinder 27
The lower hollow part 32 of the piston 19 is equipped with an O-ring 31 that is always in close contact with the piston 19, which moves up and down in conjunction with the piston 19 depending on the water pressure of the branch pipe attachment part (secondary) 13, and comes into close contact with the cylinder 28 or detached from it. Furthermore, a valve piece 36 which is constantly given a weak upward force by a spring 34 is fitted loosely, and an operating rod 42 is loosely fitted inside the piston 19 and valve piece 36. The operation stick 42 is the piston 19
The operation stick 4 is also attached to the packing 30 installed inside the
The gaskets 39 and 40 attached to the cylinder 29 are moved up and down by turning the handle 17 attached above while being in close contact with the valve piece, and the O-ring 41 mounted below is brought into close contact with the cylinder 29 or detached from the cylinder 29. Drain valve with pressure reduction and backflow prevention mechanism.