**Square Positive Arch Slotted Rupture Disc (LFF)**
Shanghai Qiwei Valve Co., Ltd. is a leading manufacturer of safety devices such as rupture discs, pressure regulators, valves, and more. Among our key products is the **Square Positive Arch Slotted Rupture Disc (LFF)**, designed for reliable overpressure protection in various industrial applications.
The **Positive Arch Slotted Rupture Disc** consists of an arched metal film with slits and a sealing layer. It functions by bursting at a pre-determined pressure, releasing excess pressure to protect equipment and personnel. This type of rupture disc is ideal for use with gases, liquids, and even dust, making it versatile across multiple industries.
### Key Technical Features:
- **Applicable media:** Gas, liquid, and dust.
- **Maximum working pressure:** Up to 80% of the minimum burst pressure.
- **Minimal debris after rupture:** Ensures clean operation.
- **Vacuum and back pressure resistance:** Suitable for complex systems.
- **Low burst pressure suitability:** Designed for low-pressure environments.
- **Pressure fatigue resistance:** Limited, so it's best used in single-use scenarios.
### Technical Specifications Table:
| Parameter | Value |
|----------|-------|
| Venting range (mm) | 25–900 |
| Normal temperature burst pressure (MPa) | 0.005–20.0 |
| Back pressure bracket | Optional |
| Gripper type | LJC |
| Dynamic response time | >1/1000 second |
| Suitable for flammable/explosive media | Yes |
| Fatigue life | >500 cycles |
| Risk of spark generation | Very low |
| Compatibility with safety valves | Yes |
| Recommended usage | Low-pressure conditions |
### Manufacturing Pressure Range Table:
| Venting Caliber (mm) | Non-Metallic Sealing Film (F4/F46) | Aluminum Film | Other Metal Sealing Films (Nickel/316L) |
|----------------------|------------------------------------|---------------|----------------------------------------|
| 25 | 0.1–8.0 | 1.2–12.0 | 2.4–20.0 |
| 32 | 0.1–7.0 | 1.0–12.0 | 2.0–18.0 |
| 40 | 0.1–6.0 | 0.8–10.0 | 1.6–15.0 |
| 50 | 0.05–5.0 | 0.6–8.0 | 1.2–12.0 |
| 65 | 0.05–4.0 | 0.5–6.0 | 1.0–10.0 |
| 80 | 0.04–3.0 | 0.4–5.0 | 0.8–10.0 |
| 100 | 0.03–2.5 | 0.3–4.0 | 0.6–8.0 |
| 125 | 0.025–2.5 | 0.25–3.5 | 0.5–6.0 |
| 150 | 0.02–2.0 | 0.2–3.5 | 0.4–5.5 |
| 200 | 0.015–1.5 | 0.15–3.0 | 0.3–5.0 |
| 250 | 0.015–1.0 | 0.15–2.5 | 0.3–4.5 |
| 300 | 0.015–0.8 | 0.1–2.0 | 0.25–4.0 |
| 350 | 0.015–0.6 | 0.1–1.5 | 0.2–3.5 |
| 400 | 0.015–0.4 | 0.08–1.0 | 0.2–3.0 |
| 450 | 0.01–0.3 | 0.08–0.8 | 0.2–2.5 |
| 500 | 0.01–0.3 | 0.06–0.8 | 0.4–2.0 |
| 600 | 0.01–0.3 | 0.05–0.6 | 0.3–1.5 |
| 700 | 0.01–0.2 | 0.04–0.6 | 0.25–1.5 |
| 800 | 0.01–0.2 | 0.04–0.6 | 0.25–1.5 |
### Notes on Material and Operating Temperature:
| Sealing Film Type | Maximum Operating Temperature |
|-------------------|-------------------------------|
| PTFE (F4) | 260°C |
| Polyperfluoroethylene Propylene (F46) | 204°C |
| Aluminum (Al) | 450°C |
| Nickel (Ni) | 500°C |
| 316L Stainless Steel | 500°C |
Please note: The data provided is based on Austrian solid stainless steel and is for reference only. For custom designs or special materials, contact us directly to ensure compatibility and delivery timelines.
---
### What is a Rupture Disc?
A rupture disc is a critical safety device used in pressure vessels and pipelines to relieve pressure when it exceeds safe limits. It acts quickly to prevent catastrophic failure, protecting both human lives and property. The device typically includes two parts: the **rupture disc**, which bursts at a set pressure, and the **gripper**, which holds the disc in place.
### Advantages of Rupture Discs:
- **Simple structure** and **high sensitivity**
- **No leakage** and **strong venting capacity**
- **Operates reliably** in high or low temperatures, viscous, or corrosive environments
- **Ideal for ultra-high pressure vessels**
### Working Principle:
The rupture disc works under static pressure. When the pressure difference reaches the set point, the disc ruptures, allowing the fluid to escape and reducing the pressure in the system. This is a **one-time use** device, meaning it cannot be reset once activated.
### Key Applications:
- Industrial chemical plants
- Petrochemical facilities
- Power generation (nuclear, thermal)
- Aerospace and defense
- Pharmaceutical and food processing
### Types of Rupture Discs:
1. **Positive Arch**: Pressure acts on the concave side.
- Examples: Positive arch open slit, positive arch with groove.
2. **Reverse Arch**: Pressure acts on the convex side.
- Examples: Reverse arch, reverse arch with groove.
3. **Flat Type**: Pressure acts on a flat surface.
- Examples: Flat plate, slotted flat, slotted.
### Materials Used:
- **Metallic**: Stainless steel, nickel, Inconel, titanium, etc.
- **Non-metallic**: Graphite, fluoroplastic, plexiglass.
- **Composite**: Metal and non-metal combinations.
Whether you're looking for a **gas bus valve**, **oxygen cylinder valve**, or a **safety device**, Shanghai Qiwei Valve Co., Ltd. offers high-quality solutions tailored to your needs. Contact us today for customized options and expert support.
**Keywords:** Square positive arch slotted rupture disc, LFF, rupture disc, safety device, valve, pressure reducer, Shanghai Qiwei, oxygen cylinder valve, safety valve, globe valve, gate valve, solenoid valve, filter, industrial safety.
WPC Composite Decking is strong durable and inexpensive, very low maintenance and a superior alternative to timber decking. Our WPC decking is made from 50% hardwood fibres, 40% recycled polyethene and a 10% mix of bonding agents and additives. Our decking is manufactured to be stronger than traditional wood options as the wood is reinforced by the bonding agent. recyclable and eco friendly and low carbon , Our boards stand the test of time as they are weatherproof – mildew proof and will stand the test of time . WPC Decking will withstand temperature fluctuations and moisture and is non cracking like woodOur Decking is an ECO friendly choice for your garden or commercial property, as they are made of non-toxic and 100% recyclable materials. This is the new generation of outdoor materials. Our WPC Decking comes in 3 colours, Light Grey, Dark Grey & Coffee.
Wpc Decking,Outdoor Decking Wpc,Wpc Wood Grain Flooring,Wpc Deck Panel
Shandong Zeen Decoration Material Co., Ltd. , https://www.zeendecor.com