Model M4500ABP is a High Flow Back Pressure Booster designed for automated or remote controlling of the back pressure or relief operation typically found in tank systems and other pressurized systems.
Operating Principles
The Model 4500ABP Booster is a pneumatic device capable of high flow capacity. This device uses a force balance system to open the relief valve and vent system pressure when the set point is exceeded. When system pressure increases, the force on the bottom of the Diaphragm Assembly increases beyond the set point, the assembly moves upward, lifting the Relief Valve from its seat and vents the system air.
Features
Model 4500ABP Volume Booster Features
- In its pilot-operated design, the M4500ABP will operate from a signal pressure of up to 150 psig [10.0 BAR] (1000kPa) and handle up to 250 psig, [17.0 BAR], (1700 kPa) system pressure
- Flow capacity of 150 SCFM (255 m3/HR) - extremely fast and responsive operation
- Control sensitivity of 1" water column allows for use in high-precision applications
- Large exhaust valve design provides high flow in back-pressure applications
- Separate control chamber isolates the diaphragm from the main flow to eliminate hunting and buzzing
- Aspirator tube design minimizes pressure drop at the final control element under flow conditions
- Unitized construction allows servicing without removal
Specifications
Model 4500ABP Volume Booster Specifications
- Maximum Signal Pressure: 150 psig, [10.0 BAR], (1000 kPa)
- Maximum System Pressure: 250 psig, [17.0 BAR], (1700 kPa)
- Flow Capacity (SCFM): 150 (255 m3/HR) @ 100 psig, [7.0 BAR]
- Setpoint: 1" (2.54 cm) Water Column
- Ambient Temperature: -40° F to +200°F, (-40° C to +93° C)
- Materials of Construction:
- Body and Housing: Aluminum
- Trim: Zinc Plated Steel, Brass
- Diaphragm: Nitrile on Dacron
Dimensions
Model 4500ABP Volume Booster Dimensions
Q & A
Model 4500ABP Volume Booster Q & A
+What are the key technical specifications of the M4500ABP?
The Fairchild M4500ABP is a high-flow back-pressure pneumatic booster capable of handling up to 250 psig (17 bar) system pressure with flow rates around 150 SCFM (255 m3/h). It typically offers pilot pressure capability up to 150 psig, a Cv near 3.0, and port sizes ranging from 3/8" to 3/4" in NPT or BSP thread types. Its rugged, pilot-operated design and wide operating temperature range make it suitable for demanding applications across North America, Europe, and global industrial markets.
+How do I size the M4500ABP for my application?
Sizing the M4500ABP involves understanding your required back-pressure setpoint, the amount of gas or air you need to relieve or supply, and whether your system’s supply pressure aligns with the booster’s ratings. You also need to confirm that its flow capacity, Cv value, and connection types match your piping standard. Environmental conditions, actuator demands, and material compatibility should also be considered to ensure optimal performance in U.S., Canadian, or European installations.
+What should I know about installation and maintenance?
Proper installation requires clean, dry supply air, correctly sized and matched port threads, and a mounting position that allows easy access to pilot connections. Maintaining the M4500ABP typically involves routine leak checks, verifying responsiveness, and replacing elastomers or seals as they wear. Compatibility with downstream valves, actuators, and environmental conditions should always be evaluated to maintain reliable performance across global industrial environments.
+ What are the benefits of the M4500ABP and its typical applications?
The M4500ABP is valued for its ability to deliver high flow, fast response, and stable back-pressure control, making it a strong choice for tank relief systems, large pneumatic actuators, and process industries requiring precise pressure control. Its robust design and global Rotork support make it a preferred option when buyers need reliable performance, high-volume exhaust capability, and compatibility with both North American and European piping and operating standards.
+ What should I expect for pricing, lead time, and support?
Pricing depends on configuration, materials, connection types, and regional distribution, so customers typically request a formal quote from authorized Rotork or Fairchild distributors. Lead times vary based on stock levels and custom options, with quicker availability common in regions with strong Rotork supply networks such as the U.S., Canada, and Europe. Global support, documentation, and spare parts availability ensure dependable service throughout the product’s lifecycle.
Downloads
Download Rotork Fairchild Model 4500ABP Volume Booster Datasheet
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