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Vacuum Negative-Pressure Safety Valve

Model
HFA72W

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 materials for main partsTop of page

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 specificationTop of page

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

Vacuum negative-pressure safety valve dimensions (mm)Top of page

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

Vacuum negative-pressure safety valve ralated productsTop of page

• Spring Loaded Low Lift Type Safety Valve
• Closed Spring Loaded Low Lift Type-High Pressure Safety Valve
• Closed Spring Loaded Full Bore Type-High Pressure Safety Valve
• Corrugated-Duct Full-Open Type Safety Valve
• Spring Full-Open Type Safety Valve Sixth A Radiator
• Air Compressor Safety Valve
• Safety Overflow Valve
• Vacuum Negative-Pressure Safety Valve
• High Temperature And High-Pressure Safety Valve
• Special Full-Lift Safety Valve For Gas
• Safety Back-Flow Valve
• Twin spring type safety valve
• Inner Assemble Safety Valve
• Impulse Safety Valve
• Single-Lever Safety Valve
• Dual-Lever Safety Valve
• Middle Temperature And Pressure Impulse Safety Device
• Pilot Operated Safety Valve
• Micro-Open Type Safety Valve
• Spring Micro-Open Type Safety Valve
• A41C Type Pound-Grade Low Lift Spring Loaded Safety Valve
• WA41C blanced bellows spring loaded safety valve
• A42C Type Pound-Grade Low Lift Spring Loaded Safety Valve
• WA42C blanced bellows spring loaded safety valve
• A44C Type Pound-Grade Full Lift Spring Loaded Safety Valve
• WA44C blanced bellows spring loaded safety valve
• A48C Type Pound-Grade Full Lift Spring Loaded Safety Valve
• A48SC Type Pound-Grade Full Lift Spring Loaded Safety Valve
• TA、A Type Special Safety Valve Series For Oil Refining
• J Series Safety Valve With Jacket
• M、R、F Series Safety Valve Screwed/Flanged
• A46C Type Pilot-Operated Pressure Relief Valve

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