SU1229495A1 - Safety device - Google Patents

Description

The invention relates to safety devices for pipelines and vessels and can be used in district heating systems.

The purpose of the invention is to increase reliability by accelerating the recovery of medium pressure.

The drawing shows a schematic diagram of the device.

The safety device comprises a housing 1 with an inlet 2 and an outlet 3 pipelines, a locking member 4 fixed on the stem 5 of the power membrane 6, forming a piston of the drive cylinder 7, a pulse diaphragm valve 8 with an inlet 9, connected by the outlet 10 to the piston zone 11 the drive cylinder 7, and the chamber 12 of the membrane 13 to the inlet pipeline 2.

The overhead piston zone 11 of the drive cylinder 7 is divided into the upper 14 and lower 15 cavities by a partition 16 with a check valve 17 operating towards the upper cavity 14, and the lower cavity 15 is connected to the inlet 9 of the pulse diaphragm valve 8.

In addition, the upper cavity 14 is provided with a fitting 18 for filling the drive cylinder 7 with a compressed eye.

The safety device operates as follows.

When the pressure of the medium in the inlet pipe 2 is below the opening pressure of the safety device, the pulse diaphragm valve 8 is open, and the gas pressure in the upper 14 and lower 15 cavities of the over piston zone 11 is the same. This pressure is transmitted to the power membrane 6, and

Editor N. Dankulich

Compiled by Y. Nesterov

Tehred V. Kadar Proofreader E. Sirohman

2437/35

Circulation 880, Subscription VNIIPI USSR State Committee

on affairs of inventions and discoveries 113035 ,, Moscow, Zh-35, Raushsk nab. 4/5

Production and printing company, Uzhgorod, st. Project, 4

from it through the rod 5 to the locking body 4 ,, that ensures the closure of the safety device. When the medium pressure rises in

the supply line 2, the membrane 13 of the valve 8, moving closes the latter, which leads to the separation of the upper 14 and lower 15 cavities of the piston 7 of the piston 7 of the piston cylinder 7. The shut-off member 4 moves upwards under the pressure of the medium in the supply pipe 2 and opens the passage of the medium into the discharge pipe 3. The upward movement of the power membrane 6 causes the gas pressure in the lower cavity 15 to increase, and the gas from the latter through the non-return valve 17 is pushed into the upper cavity 14.

At the initial stage of reducing the pressure in the inlet pipe 2, the force membrane 6 and the shut-off element 4 remain in the upper position, the check valve 17 is closed and the gas

from the upper cavity 14 cannot flow into the lower cavity 15. After the medium pressure decreases to the nominal diaphragm 13, the pulse diaphragm valve B opens, which leads to pressure equalization in the lower 15 and upper 14 cavities of the over piston zone 11 of the drive cylinder 7, moving down the power diaphragm 6 and shut-off body 4 „and closing

safety device.

When the pressure of the medium is exceeded, the safety device makes it possible to fix the locking organ 4 in the upper position, which leads to a more rapid pressure recovery and, accordingly, to an increase in reliability.

Claims (1)

SAFETY DEVICE, mainly a heating system, comprising a housing with inlet and outlet pipes, a shut-off element fixed to the piston rod of the drive cylinder, a pulse diaphragm valve with an inlet pipe connected by the outlet pipe to the over-piston area of the drive cylinder, and the membrane chamber to the inlet pipe, characterized in that , in order to improve reliability, the supra-piston zone of the drive cylinder is divided into upper and lower cavities by a partition with a one-way valve that operates in a hundred the upper cavity, and the lower cavity is connected to the inlet of the pulse membrane valve, and the piston is made in the form of a power membrane. SU „1229495