JPH0394500U - - Google Patents

Description

[Brief explanation of drawings]

Figures 1 and 2 show an embodiment of the present invention, Figure 1 is a longitudinal side view when the flow is forward, Figure 2 is a side view when the flow is reversed, and Figure 3 shows the prior art. This is a diagram equivalent to Figure 1. 1... Flashback preventer main body, 2... Peripheral wall of 1, 4...
... Gas outlet pipe connection part, 5 ... Shutoff valve holder, 6
...Flashback prevention chamber, 7...Flame extinguishing cylinder, 10...Gas introduction nozzle, 11...Shutoff valve chamber, 12...Nozzle holder, 13...Shutoff valve body sliding hole, 14...Shutoff valve seat , 15... cutoff valve body, 15a... leg portion of 15,
18...Back end wall of 6, 19...Spring holder, 2
0...Shutoff valve spring, 21...Gas communication hole, 22...
...Through hole, 23...Check valve seat, 24...Check valve body,
25...Check valve spring, 30...Click stop device.

Claims (1)

[Scope of utility model registration request] A gas outlet pipe connecting portion 4 is formed on the peripheral wall 2 of the flashback preventer main body 1 formed with one end open, and a cutoff valve holder 5 is fitted inside the flashback preventer main body 1 to form a flashback prevention chamber 6. A flame extinguishing cylinder 7 is installed inside the flashback prevention chamber 6, a shutoff valve chamber 11 is formed inside the shutoff valve holder 5, and the outer end wall of the shutoff valve chamber 11 is connected to the gas introduction nozzle 1.
0, and a nozzle presser 12 is internally fitted into the open end of the flashback preventer main body 1, so that the cutoff valve holder 5 and the gas introduction nozzle 10 can be fixed in position within the flashback preventer main body 1. A cutoff valve body sliding hole 13 is provided in the inner end wall of the cutoff valve chamber 11, and a cutoff valve seat 14 is formed in the circumferential wall of the opening of the gas introduction nozzle 10 on the cutoff valve chamber side in the cutoff valve chamber 11. A cutoff valve body 15 is accommodated in the cutoff valve chamber 11 with its legs 15a being able to slide forward and backward within the cutoff valve body sliding hole 13, and a spring holder 19 is mounted on the back end wall 18 of the flashback prevention chamber 6. is attached so as to be able to slide forward and backward, and a shutoff valve spring 20 installed between this spring holder 19 and the back end wall 18 of the flashback prevention chamber applies closing force to the shutoff valve body 15 to the valve closing side via the spring holder 19. A gas communication hole 21 is recessed into the interior of the shutoff valve body 15 from the backfire prevention chamber 6 side, and a through hole 22 provided through the leg peripheral wall of the shutoff valve body 15 is connected to the shutoff valve chamber 11 to prevent backfire. The gas communication hole 21 is configured to be able to communicate with the chamber 6.
A check valve seat 23 is formed at the end on the side of the flashback prevention chamber, a check valve body 24 is positioned opposite to the check valve seat 23, and a check valve body 24 is positioned between the check valve body 24 and the spring holder 19. A check valve spring 25 is disposed to elastically bias the check valve body 24 toward the closing side, and the shutoff valve holder 5 and the shutoff valve body 15 are
A dry flashback preventer characterized in that a click stop device 30 is interposed between the shutoff valve body 15 and the shutoff valve body 15 to be held in the open position against the closing force of the shutoff valve spring 20. .