Shanghai Valve Factory, gas bus, rupture disc, pressure reducer, Shanghai Qiwei, oxygen cylinder valve, safety device, valve, gripper, butterfly valve, valve standard, valve type, safety valve, globe valve, gate valve, solenoid valve , filter, Shanghai Qiwei Valve Co., Ltd. square positive arch slotted rupture disc (LFF)

The positive arch slit type rupture disc is composed of an arched slit metal film and a sealing film. The burst pressure is controlled by a weakened structure of slits and holes in the arch surface. When the protected system is over-pressurized, the rupture disc is stretched and broken along the weak link, and the pressure is released, thereby protecting.

Square positive arch slotted rupture disc (LFF)
Technical characteristics  Applicable to three kinds of media: gas, liquid and dust.  The maximum working pressure can reach 80% of the minimum burst pressure.可能 There may be very little debris after blasting.  The belt bracket is subjected to vacuum and back pressure.  The structure is complicated. Suitable for occasions with low burst pressure.耐 Poor resistance to pressure fatigue.
Technical characteristics table
product name

Positive arch slitting rupture disc

Structure and loading
Force state	Stretch
Venting range (mm)	25~900
Normal temperature burst pressure range (MPa)	0.005~20.0
Back pressure bracket	Can be added
With gripper type E	LJC
Dynamic response characteristic second	>1/1000
Whether it is suitable for flammable and explosive media	Be applicable
Fatigue life times	>500
Whether it causes an impact spark	Very unlikely
Can it be used in series with the safety valve?	can
Pay attention when selecting	Mainly suitable for low pressure conditions

Manufacturing pressure range
Venting caliber

Rupture disc material

Non-metallic sealing film (F4, F46)

Aluminum film

Other metal sealing film
(nickel or 316L)

Mm

In

minPB

maxPB

minPB

maxPB

minPB

maxPB

25	1	0.1	8.0	1.2	12.0	2.4	20.0
32	11/4	0.1	7.0	1.0	12.0	2.0	18.0
40	11/2	0.1	6.0	0.8	10.0	1.6	15.0
50	2	0.05	5.0	0.6	8.0	1.2	12.0
65	21/2	0.05	4.0	0.5	6.0	1.0	10.0
80	3	0.04	3.0	0.4	5.0	0.8	10.0
100	4	0.03	2.5	0.3	4.0	0.6	8.0
125	5	0.025	2.5	0.25	3.5	0.5	6.0
150	6	0.02	2.0	0.2	3.5	0.4	5.5
200	8	0.015	1.5	0.15	3.0	0.3	5.0
250	10	0.015	1.0	0.15	2.5	0.3	4.5
300	12	0.015	0.8	0.1	2.0	0.25	4.0
350	14	0.015	0.6	0.1	1.5	0.2	3.5
400	16	0.015	0.4	0.08	1.0	0.2	3.0
450	18	0.01	0.3	0.08	0.8	0.2	2.5
500	20	0.01	0.3	0.06	0.8	0.4	2.0
600	twenty four	0.01	0.3	0.05	0.6	0.3	1.5
700	28	0.01	0.2	0.04	0.6	0.25	1.5
800	32	0.01	0.2	0.04	0.6	0.25	1.5

Matters needing attention A. The above parameters of the rupture disc material is the data of the Austrian solid stainless steel, for reference only. If the actual design is different from the data in the table, please contact our company B. If other materials, caliber can refer to the parameter list . Special materials can be negotiated with our company to guarantee delivery time. C. The operating temperature of the rupture disc is determined by the operating temperature of the sealing membrane material. Commonly used sealing film materials are F4, F46, aluminum, nickel or stainless steel, the maximum operating temperature is as follows:
Venting caliber

Non-metallic sealing film

Metal sealing film

name	PTFE	Polyperfluoroethylene propylene	aluminum	nickel	Austenitic stainless steel
Code	F4	F46	Al	Ni	316L
Maximum applicable temperature	260 ° C	204 ° C	450 ° C	500 ° C	500 ° C

D. Please consult with our company for the manufacturing parameters and structural dimensions of the square arch open rupture disc (LFF).







Tag: Square positive arch slotted rupture disc (LFF) Square positive arch slotted rupture disc Square positive arch rupture disc Square positive arch LFF slotted rupture disc Square rupture disc

Introduction to rupture discs Rupture discs are important safety devices for pressure vessels and pipelines. It can blast at the specified temperature and pressure,


Relieve pressure to protect the safety of people's lives and state property.
The rupture disc device consists of two parts, a rupture disc and a gripper. The rupture disc is a component that blasts and decompresses under the calibrated burst pressure and temperature. The gripper is an auxiliary component that holds the rupture disc at the appropriate part of the container.
The rupture disc safety device has the advantages of simple structure, sensitivity, accuracy, no leakage, strong venting capacity and the like. It can work reliably in viscous, high temperature, low temperature and corrosive environments, and is an ideal safety device for ultra high pressure vessels.
The rupture disc is an important safety device to prevent overpressure damage of pressure equipment. It is widely used in chemical, petroleum, light industry, metallurgy, nuclear power, dust removal, fire protection, aviation and other industrial sectors.
Working principle of rupture disc The rupture disc device is a pressure relief device that cannot be closed repeatedly. It is started by the static pressure at the inlet and vents pressure through the rupture of the pressurized diaphragm.
Simply speaking, it is a one-time pressure relief device. When the pressure difference between the two sides of the rupture disc reaches a predetermined value at the set blasting temperature, the rupture disc can act (break or fall off) and release the fluid.
The characteristics of the rupture disc (1) are suitable for the slurry, viscous and corrosive process medium. In this case, the safety valve does not work. (2) The inertia is small, and it can respond quickly to the rapidly increasing pressure. (3) In case of fire or other accidents, after the main pressure relief device is opened, the rupture disc can be used as an additional pressure relief device (4). It is tight and leak-free. It is suitable for pressure vessels containing expensive or toxic media. (5) Specifications and models are available. Material manufacturing, adaptability (6) Suitable place for maintenance and replacement of rupture discs (1) The working medium in the pressure vessel or pipeline is sticky or easy to crystallize and polymerize, and it is easy to stick or block the safety valve disc and the base. The place of the safety valve;
(2) The chemical reaction of the material in the pressure vessel may cause the pressure in the container to rise sharply instantaneously. The safety valve cannot open the pressure relief place in time;
(3) The working medium in the pressure vessel or pipeline is highly toxic gas or expensive gas, and there may be a place where leakage and environmental pollution and waste are caused by the safety valve;
(4) Pressure vessels and pressure piping require all venting or full venting where there is no obstruction;
(5) Other places that are not suitable for safety valves and are suitable for rupture discs.
Classification of rupture discs
1. According to the type, the (1) positive arch type:


System pressure acts on the concave surface of the rupture disc.
Positive arch normal arch open seam positive arch with groove (2) Reverse arch type: system pressure acts on the convex surface of the rupture disc.


Reverse arch turret reverse arch crocodile reverse arch with groove (3) flat type: system pressure acts on the plane of the rupture disc.


Flat plate flat slotted slotted slot
2. According to the material (1) Metal: stainless steel, pure nickel, Hastelloy, Monel, Inconel nickel, titanium, niobium, zirconium, etc. (2) Non-metal: graphite, fluoroplastic, plexiglass (3) metal Composite non-metal


Shanghai Valve Factory, gas bus, rupture disc, pressure reducer, Shanghai Qiwei, oxygen cylinder valve, safety device, valve, gripper, butterfly valve, valve standard, valve type, safety valve, globe valve, gate valve, solenoid valve , filter, Shanghai Qiwei Valve Co., Ltd.

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