Shanghai Qiwei Valve Co., Ltd. is a leading manufacturer of various valves, gas buses, rupture discs, pressure regulators, oxygen cylinder valves, and safety devices. Among their products is the Square Positive Arch Slotted Rupture Disc (LFF), a specialized safety component designed to protect systems from overpressure by bursting at a predetermined pressure level.
The Square Positive Arch Slotted Rupture Disc (LFF) is composed of an arched metal film with slits and a sealing film. Its burst pressure is precisely controlled by the weakened structure of the slits and holes on the arch surface. When the system experiences overpressure, the disc stretches and ruptures along these weak points, releasing the pressure and protecting the equipment.
**Technical Characteristics:**
- Suitable for gas, liquid, and dust media.
- Maximum working pressure can reach up to 80% of the minimum burst pressure.
- Minimal debris after bursting.
- Designed to withstand vacuum and back pressure.
- Complex structure, ideal for low burst pressure applications.
- Limited resistance to pressure fatigue.
**Technical Specifications Table:**
| Product Name | Positive Arch Slitting Rupture Disc |
|--------------|------------------------------------|
| Structure and Loading | [Image] |
| Force State | Stretch |
| Venting Range (mm) | 25~900 |
| Normal Temperature Burst Pressure Range (MPa) | 0.005~20.0 |
| Back Pressure Bracket | Can be added |
| Gripper Type E | LJC |
| Dynamic Response Characteristic (s) | >1/1000 |
| Suitable for Flammable and Explosive Media | Yes |
| Fatigue Life (times) | >500 |
| Likely to Cause Impact Spark | Very unlikely |
| Can Be Used in Series with Safety Valve | Yes |
| Selection Notes | Mainly suitable for low-pressure conditions |
**Manufacturing Pressure Range Table:**
| Venting Caliber | Non-metallic Sealing Film (F4, F46) | Aluminum Film | Other Metal Sealing Film (Nickel or 316L) |
|------------------|--------------------------------------|---------------|------------------------------------------|
| 25 mm / 1" | 0.1–8.0 MPa | 1.2–12.0 MPa | 2.4–20.0 MPa |
| 32 mm / 1¼" | 0.1–7.0 MPa | 1.0–12.0 MPa | 2.0–18.0 MPa |
| 40 mm / 1½" | 0.1–6.0 MPa | 0.8–10.0 MPa | 1.6–15.0 MPa |
| ... | ... | ... | ... |
**Important Notes:**
- The above data refers to Austrian solid stainless steel. If your design differs, please contact our company.
- For other materials or calibers, refer to the parameter list. Special materials can be negotiated with us to ensure timely delivery.
- Operating temperature depends on the sealing membrane material. Common options include PTFE (F4), PFA (F46), aluminum, nickel, and 316L stainless steel. Their maximum operating temperatures are as follows:
| Sealing Material | Max Temp (°C) |
|------------------|----------------|
| F4 (PTFE) | 260 |
| F46 (PFA) | 204 |
| Al (Aluminum) | 450 |
| Ni (Nickel) | 500 |
| 316L (Stainless Steel) | 500 |
For more details about manufacturing parameters and dimensions of the Square Positive Arch Slotted Rupture Disc (LFF), please consult our team.
**Introduction to Rupture Discs:**
Rupture discs are essential safety devices used in pressure vessels and pipelines. They rupture at a specified pressure and temperature to relieve pressure and protect both personnel and equipment. A typical rupture disc device consists of the disc itself and a gripper that holds it in place.
Rupture discs offer several advantages: simple construction, high sensitivity, no leakage, strong venting capacity, and reliability in harsh environments such as high or low temperatures, viscosity, and corrosion. They are widely used in chemical, petrochemical, power, and aerospace industries.
**Working Principle:**
A rupture disc is a one-time pressure relief device. It activates when the pressure difference across it reaches a pre-set threshold, causing the disc to rupture and release the pressure. This ensures rapid response to sudden pressure increases.
**Key Features:**
- Ideal for viscous, corrosive, or sticky media where safety valves may not function properly.
- Fast response time due to low inertia.
- Provides additional protection in emergencies like fires.
- Leak-proof, making it suitable for toxic or expensive gases.
- Available in various sizes and materials, including metals (stainless steel, nickel, etc.) and non-metals (fluoroplastics, graphite).
**Classification of Rupture Discs:**
1. **Positive Arch Type:** Pressure acts on the concave side.
2. **Reverse Arch Type:** Pressure acts on the convex side.
3. **Flat Type:** Pressure acts on the flat surface.
**Applications:**
- Where media is sticky, viscous, or prone to crystallization.
- In situations where pressure rises rapidly.
- For handling toxic or costly gases.
- In systems requiring full venting without obstructions.
Shanghai Qiwei Valve Co., Ltd. offers high-quality rupture discs and related components, ensuring safety and performance in critical industrial applications.
Tag: Square Positive Arch Slotted Rupture Disc (LFF), Square Positive Arch Rupture Disc, LFF Rupture Disc, Safety Device, Valve Manufacturer, Pressure Relief Equipment
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