Description
Overview
The Type 715BP Signal Operated Precision Back Pressure Regulator is a high-flow, highly accurate pneumatic relief valve with a 1:1 signal-to-output pressure ratio. It is normally closed and remains closed until the upstream inlet pressure exceeds the applied signal pressure.
When upstream pressure rises above the signal pressure, the valve opens and allows air to flow until the upstream pressure falls below the signal pressure. This operating principle provides precise protection against overpressurization while allowing the regulator to respond quickly to changing system conditions.
The Type 715BP can also function as a pneumatic flow controller. By varying the signal pressure with a manual regulator or I/P transducer, the unit increases or decreases the amount of air permitted to flow from upstream to downstream. Its isolated control chamber helps prevent hunting and vibration for quiet, stable operation.
Key Features
- 1:1 signal-to-output pressure ratio
- Normally closed operation
- Highly accurate signal-operated pressure control
- Provides protection against pneumatic overpressurization
- Can be used as a precision flow controller
- High flow capacity up to 90 scfm (2,548 Nl/min)
- Fast response to controlled system pressure variation
- Sensitivity of 1/4″ (6.4 mm) water column
- Separate control chamber isolates the diaphragm from the flow path
- Quiet performance with reduced hunting and vibration
- Can be controlled by a manual pressure regulator or I/P transducer
- Available with 1/4″, 3/8″, and 1/2″ NPT or BSPP porting
- On-line maintenance without removing the unit from the air line
- Optional BSPP porting
- Optional ATEX 2014/34/EU configuration
Performance Characteristics
- Signal-to-Output Ratio: 1:1
- Ratio Accuracy: 1.0% of a 100 psig (7 bar) signal span
- Flow Capacity: Up to 90 scfm (2,548 Nl/min)
- Cv: 1.5 for 1/4″ NPT; 2.0 for 3/8″ and 1/2″ NPT
- Maximum System Pressure: 250 psig (17.25 bar)
- Maximum Signal Pressure: 150 psig (10 bar)
- Sensitivity: 1/4″ (6.4 mm) water column
- Inlet and Outlet Port Sizes: 1/4″, 3/8″, or 1/2″ NPT/BSPP
- Gauge Ports: Two 1/4″ NPT/BSPP ports
- Ambient Temperature Range: 0°F to 150°F (-18°C to 66°C)
- Weight: 1.20 lb (0.54 kg)
- Body Material: Die-cast aluminum alloy with baked enamel finish
- Trim Materials: Acetal, brass, and plated steel
Relief capacity depends on upstream pressure, signal pressure, port size, and allowable pressure rise. For example, with a 30 psig signal pressure, the valve begins to open when upstream pressure exceeds 30 psig. At an upstream pressure of 40 psig, the Type 715BP can flow approximately 30 scfm.
How to Select the Right Configuration
Selecting the proper Type 715BP configuration depends on the required flow capacity, connection size, signal source, system pressure, installation standard, and hazardous-area requirements.
- Select 1/4″ porting for compact installations and lower flow requirements.
- Select 3/8″ or 1/2″ porting when higher flow capacity is required.
- Use a manual pressure regulator when a fixed or manually adjustable pneumatic signal is preferred.
- Use an I/P transducer when the signal pressure must vary in response to an electrical control signal.
- Use the Type 715BP for overpressure protection when the valve should open only after upstream pressure exceeds the signal pressure.
- Use it as a flow controller when varying signal pressure is required to modulate downstream airflow.
- Confirm that system pressure does not exceed 250 psig.
- Confirm that signal pressure does not exceed 150 psig.
- Select BSPP porting for systems using parallel British Standard Pipe connections.
- Select the ATEX option when the installation requires ATEX 2014/34/EU compliance.
- Add the mounting bracket when side mounting is required.
For additional guidance:
Applications
The Type 715BP is designed for pneumatic systems that require signal-operated overpressure protection, precision flow control, or remote pressure adjustment.
- Pneumatic overpressure protection
- Compressor and receiver systems
- Precision airflow control
- Remote pressure control systems
- I/P transducer-controlled flow systems
- Manual pneumatic control systems
- Industrial process control
- Instrument air systems
- OEM pneumatic equipment
- Test stands and calibration systems
- Variable flow applications
In an overpressure protection application, the Type 715BP remains closed until the upstream pressure exceeds the applied signal. In a flow-control application, changing the signal pressure modulates the valve opening and controls airflow to the downstream process.
Models & Configurations
Type 715BP Ordering Structure
715 – [Port Size] A [Options]
Port Sizes
- B = 1/4″ NPT/BSPP
- C = 3/8″ NPT/BSPP
- D = 1/2″ NPT/BSPP
Ratio
- A = 1:1 signal-to-output pressure ratio
Available Options
- U = BSPP Porting
- X = ATEX 2014/34/EU
Accessories
- Mounting Bracket, zinc-plated steel: P/N 446-707-025
- 0-15 psi Gauge, 1/4″ NPT back mount: P/N 446-725-003
- 0-30 psi Gauge, 1/4″ NPT back mount: P/N 446-725-004
- 0-60 psi Gauge, 1/4″ NPT back mount: P/N 446-725-001
- 0-160 psi Gauge, 1/4″ NPT back mount: P/N 446-725-002
Technical Resources
- Product Data Sheet
- Installation Instructions
- Product Configurator
- 3D CAD Models
- Engineering Support Resources
FAQs
What is the Type 715BP signal operated back pressure regulator used for?
The Type 715BP is used for pneumatic overpressure protection and precision flow control. It opens when upstream pressure exceeds the applied signal pressure.
How does the 1:1 signal-to-output ratio work?
The regulator compares upstream pressure with the applied pneumatic signal. When upstream pressure exceeds the signal pressure, the valve opens and relieves or passes air until upstream pressure falls below the signal pressure.
Is the Type 715BP normally open or normally closed?
The Type 715BP is normally closed. It remains closed until upstream pressure exceeds the applied signal pressure.
Can the Type 715BP be used as a flow controller?
Yes. Varying the signal pressure with a manual regulator or I/P transducer changes the valve opening and controls the amount of air flowing from upstream to downstream.
What is the maximum flow capacity?
The Type 715BP can flow up to 90 scfm (2,548 Nl/min), depending on system pressure and port size.
What are the maximum system and signal pressures?
The maximum system pressure is 250 psig (17.25 bar), and the maximum signal pressure is 150 psig (10 bar).
What port sizes are available?
The Type 715BP is available with 1/4″, 3/8″, and 1/2″ NPT or BSPP inlet and outlet ports.
Can the Type 715BP be serviced without removing it from the line?
Yes. The Type 715BP is designed for on-line maintenance and can be disassembled and serviced without being removed from the air line.
