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Reverse Buckling Rupture Disks


The Reverse Buckling disk represents the best in rupture disk (bursting disc) technology. Invented by BS&B, our range of reverse buckling products provides a pressure relief solution for burst pressures ranging from a few inches of water column / a few millibar to over 70,000 psig / 4800 bar.

Burst pressure is accurately controlled by a combination of material properties and the shape of the disk domed structure. By loading the Reverse Buckling disk in compression it is able to resist operating pressures up to 100% of minimum burst pressure even under pressure cycling or pulsating conditions.

Designed for non fragmentation upon activation, Reverse Buckling disks are recommended for combination with pressure relief valves to isolate them from normal process conditions ensuring excellent leak tightness, reduced valve maintenance expenses and often allowing the use lower cost valve trim.

Forward Acting Rupture Disks


Forward acting, or conventional rupture disks (bursting discs) have been a mainstay in process applications since BS&B developed the first rupture in 1931. Developed in 1934, the Type B disk, the "granddaddy" of all rupture disks (bursting discs) is still the disk-of-choice in many applications.

Applying load to the concave side, the disk is subjected to tension forces. Forward acting disks regulate burst pressures by the tensile strength of the material.

For low burst pressures, the Type D disk has a slotted metal top section and a metal or fluorocarbon seal. For higher operating ratios, the scored NU-SAF family of disks is often selected for polymerization processes. Our VAC-SAF line offers protection from excessive vacuum or overpressure.

For tank car applications, the ITC disk protects intermodel tank containers while the SR-TC is a surge resistant disk for railroad took cars and over-the-road trailer service industry.

A wide range of standard rupture disk (bursting disc) assemblies is available for your specific application. These Threaded and Welded Assembliesare discarded after disk rupture. Customized designs are available for customer applications that cannot be met using standard assembly designs.

Rupture Disks


BS&B manufactures each graphite rupture disk (bursting disc) from a pure block of graphite. By impregnating the porous graphite with resin, you can be assured of a product that can withstand almost any aggressive chemical attack. Our manufacturing process achieves:

  • Wide range of sizes from½" (12mm) to 60" (1200mm) 

  • Superior corrosion resistance 

  • Operating temperatures up to 400º F, rising to 800º F with the Hi-Temp Assembly (HTA) upstream of a disk 

  • Large burst pressure range (0.25 - 1000psig) (0.017 - 70 Bar) 

  • Zero manufacturing design range 

  • Tight burst pressure tolerances 

  • Supplied complete with gaskets for immediate installation and reduced downtime 

  • Elevated temperature testing at no additional charge 

  • Low KR (Flow Resistance) – Consult BS&B

Safety Heads


Many designs and types of fittings are used as holders for rupture disks (bursting discs) and are fabricated from metal(s) compatible with the process media and atmospheric environment. Each BS&B safety head is designed for optimum safety and performance.

  • Reduced Inventory Costs. One head fits most standard international flanges eliminating the need to stock unnecessary and costly inventory. 

  • Simple, Fail-Safe Installation. The asymmetric locating pins and standard welded J-Bolt ensure correct orientation by eliminating possible human error.

  • Leak-Tight Bite-Type Seal. BS&B is the only disk manufacturer who machines a Bite-Type seal into the inlet flange of the Safety Head that engages the disk material proper creating a bubble-tight seal. 

  • Easy Cleaning and Inspection. Maintenance can be done without replacing the disk due to the pretorqued cap screws, which maintain the clamping load on the disk.

For conventional pre-bulged rupture disks (bursting discs) we offer Bolted Type Safety Heads. Where space is limited and where quick or frequent change-out of rupture disk may be necessary, the Union Type Safety Head is available.

With a unique curved design, the LO-TO-FLO™ Safety Head limits process buildup to ensure superior over-pressure protection for high viscosity liquids.

Whether your process requires a Sanitary / Aseptic Fitting or a QUICKSERT™ flat-faced flange assembly holder, BS&B offers the right safety head for your application.

Protection Devices


Common industrial processes have the potential for a dust explosion. Where combustible material is conveyed, filtered, heated, milled, or sprayed in a fine powdered form, the three elements of the ‘explosion triangle’ can combine: dust + air + ignition. When these occur in a confined and unprotected process volume with the dust dispersed, a deflagration can trigger resulting in an immediate overpressure and flameball.

An explosion risk assessment will typically recommend that a series of protection measures be implemented ranging from improvements in housekeeping to investment in protection equipment. Applying protection technology requires that the constraints of the process equipment, building facilities, environment and budgets are taken into account in achieving the level of personnel safety required by codes and standards.

Flexibility is provided by BS&B’s proven range of protection technology that includes explosion venting, explosion suppression, a choice of chemical & mechanical systems for the isolation of interconnected process equipment and spark detection & extinguishing equipment to manage a source of both dust explosion ignition and fire.

Sensors and Monitors

Alert Sensors® provide immediate warning of a ruptured disk when used with a BS&B Burst Disk Monitor or other suitable electrical monitoring equipment. When a disk or vent ruptures, the process flow through the device causes the sensor's conductive circuit to break. The disruption of the current flowing through the circuit activates a Burst Disk Monitor (BDM)or other suitable electrical monitoring equipment to give a visual and/or audible signal.

Features of BS&B Monitors and Sensors 

  • Instant Notification of a Ruptured Disk 

  • Quicker Corrective Action 

  • Activates Valves/Pumps to Control or Shut-Down Process 

  • Lessens Critical Downtime 

  • Reduces Product Loss 

  • Minimizes Environmental Pollution

Buckling Pin 
Relief Valves


Buckling Pin technology offers an accurate and reliable means of calibrating pressure relief devices. BS&B has developed the BPRV™ Buckling Pin Relief Valve for in-line pressure or vacuum relief offering quick and simple external resetting. The BPRV is suitable for both gas and liquid applications, and provides a full relief opening at a pre-determined set pressure.

Safety Relief Valves


Standard right angle reclosing Safety Relief Valves, with conventional and/or balanced (bellows) designs. Available in full & semi-nozzle models, all Safety Relief Valves are direct action, with adjusting rings, spring loaded, pressure management devices. The are available in flanged & threaded connections, or special connection orders with a wide variety of options. Accessories are available, including a test gag, levers (packed or plain), detectors, and insulating jackets. The valves are available in carbon steel, stainless steel, and special alloys (duplex stainless steel, super duplex stainless steel, hastelloy, inconel, titanium, tantalum, etc.).

Flame Arresters, Detonation Arresters, Breather Vents,
and Pressure / Vacuum Vents


Flame arresters stop the transmission of flames through piping after an ignition event associated with combustible gas inside the piping. They also stop the transmission of flames into a tank or piping from an ignition event outside of a tank or piping that is venting combustible gas into the atmosphere.

The arresters are designed to reduce the heat associated with the flame as the gas flows through it. The heat is reduced to a point where the flame is extinguished. Each arrester is configured specifically to meet application requirements. Gas classification, flow requirements, pressure-drop requirements and the number of pipe diameters between the arrester and the flame’s ignition source factor into the arrester’s proposed configuration.

BS&B markets its flame arresters under the FlameSaf brand name.

Tank Vents

Tank vents (AKA conservation vents, breather vents or pressure/vacuum relief valves) prevent tanks from exploding due to overpressure. They also prevent tanks from collapsing, or imploding, due to vacuum.

The vents relieve overpressure related to pumping fluids into the tank, atmospheric heating of the tank and heating of the tank due to fire that is external to the tank. They also relieve vacuum related to pumping fluids out of the tank and atmospheric cooling of the tank. The customer chooses the point at which the vents provide relief of either pressure or vacuum.

BS&B markets its tank vents under the TankSaf brand name.



BS&B has served the OEM market for over 75 years. Our experience extends from rupture disks & buckling pin valve technology to explosion protection and prevention devices along with the sensors and monitors that confirm the status of these safety solutions. Using standard building blocks of technology, our design engineers will identify choices to fast track your project. Our experience is the key to the selection or development of the right safety device for your needs. 

Areas of particular expertise include:

  • Devices for cryogenic or elevated temperature service

  • Small, light weight rupture disk assemblies 

  • High volume automated components (TS16949 certified)

  • Standard assembly designs adaptable to your burst pressure

  • Threaded, flanged or custom connections from 1/8” (3mm) to 72” (1800mm) diameter

  • Low to high set pressures (4” WG/ 10mBar to over 100,000psig/ 6,900 Bar)

  • Control of burst disk fragmentation

  • Extreme control of leak tightness

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