Vacuum Negative-Pressure Safety Valve

Vacuum negative-pressure safety valve applications

HFA72W is applicable in negative pressure sys-tem with temperature ≤200℃. When the negative pressure in the container exceeds the allowable value, the valve will open automatically and absorbs air; when the negative pressure in the container reaches the allowable value, the valve will close au-somatically so as to protect the equipment and the system. It is to be installed in normal non-negative pressure systems. When the discharge valve of the container and system has not opened, which pro-dukes the negative pressure, this valve will open automatically.

Vacuum negative-pressure safety valve brief figure of structure

Vacuum Negative-Pressure Safety Valve
Structure of Vacuum Negative-Pressure Safety Valve

Vacuum negative-pressure safety valve materials for main parts


No.
Name of part HFA72W-P
Materials
HFA72W-R
Materials
1 Body ZG1Cr18Ni9Ti ZG1Cr18Ni12Mo2Ti
2 Nozzle 1Cr18Ni9Ti ZG1Cr18Ni12Mo2Ti
3 Adjusting ring 1Cr18Ni9Ti 1Cr18Ni12Mo2Ti
4 Bonnet ZG1Cr18Ni9Ti 1Cr18Ni9Ti
5 Stem 1Cr18Ni9Ti 1Cr18Ni12Mo2Ti
6 Spring 50CrVA Coated Teflon

Vacuum negative-pressure safety valve Chief property and specification

Working
Temperature
≤200℃
Suitable
Medium
HFA72W-10P
Nitric acid etc. medium
HFA72W-10R
Acetic acid etc. medium

Vacuum negative-pressure safety valve dimensions (mm)


Nominal diameter
DN(mm)
Dimension (mm)
D D1 D2 Z-¢d b f1 H
15 95 65 45 4-14 14 2 110
20 105 75 55 4-14 16 2 130
25 115 85 65 4-14 16 2 150
32 145 100 78 4-18 18 2 180
40 150 110 85 4-18 18 3 200
50 165 125 100 4-18 20 3 221
80 200 160 135 4-18 22 3 245
100 220 180 155 8-18 22 3 253
125 250 210 185 8-18 24 3 280
150 285 240 210 8-23 24 3 329
200 340 295 265 8-23 26 3 377
250 395 350 320 12-23 28 3 440

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Catalog: Safety valves

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