Masoneilan 78-80H High-Capacity Three-Way Pneumatic Transfer Valve
The Masoneilan 78-80H High-Capacity Three-Way Transfer Valve is designed for automatic pneumatic switching and actuator protection in industrial control valve systems.
- Three-Way Valve Configuration
- 1.72 MPa (17.2 Bar) Maximum Body Operating Pressure
- Cv 4.5 Inlet-to-Outlet Flow Coefficient
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- 1 YearWarranty
Product Overview
The Masoneilan 78-80H High-Capacity Three-Way Transfer Valve is designed for automatic pneumatic switching and actuator protection in industrial control valve systems. Manufactured under the Masoneilan brand by Baker Hughes, this valve combines a floating-ball pilot valve with a three-port transfer valve to redirect compressed air when the monitored signal pressure falls below a preset threshold. Its high-flow construction supports reliable pneumatic switching, controlled actuator response, and protection during instrument air supply failures.
Part of the Masoneilan 78-80 Series, the 78-80H features an adjustable switching pressure range of 100–700 kPa and a maximum body operating pressure of 1.72 MPa. It provides high-capacity pneumatic flow, with a Cv of 4.5 from inlet to outlet and 5.0 from outlet to exhaust. The valve can also be configured for pneumatic lock-up service by plugging its exhaust ports, subject to the actuator's required failure action. It is suitable for oil and gas processing, chemical plants, power generation, refineries, and industrial process automation.
Technical Specifications
|
Specification |
Value |
|---|---|
|
Product Name |
High-Capacity Three-Way Pneumatic Transfer Valve |
|
Manufacturer / Brand |
Baker Hughes / Masoneilan |
|
Main Model |
78-80H |
|
Product Series |
78-80 |
|
Product Type |
Pneumatic Transfer Valve |
|
Valve Configuration |
Three-Way |
|
Capacity Classification |
High Capacity |
|
Pilot Valve |
Integrated Floating-Ball Pilot |
|
Operating Principle |
Pressure-Actuated Pneumatic Switching |
|
Maximum Body Operating Pressure |
1.72 MPa (17.2 Bar) |
|
Maximum Signal Pressure |
1.03 MPa (10.3 Bar) |
|
Adjustable Switching Pressure |
100–700 kPa (1–7 Bar) |
|
Hysteresis |
34 kPa or Less |
|
Inlet-to-Outlet Flow Coefficient |
Cv 4.5 |
|
Outlet-to-Exhaust Flow Coefficient |
Cv 5.0 |
|
Standard Main Port Connections |
Rc 1/2 |
|
Optional Main Port Connections |
1/2 Inch NPT |
|
Standard Signal Connection |
Rc 1/4 |
|
Optional Signal Connection |
1/4 Inch NPT |
|
Standard Housing Material |
Aluminium Alloy |
|
Optional Housing Material |
316L Stainless Steel |
|
Standard Operating Temperature |
−30°C to +83°C |
|
Optional Temperature Configuration |
0°C to +100°C |
|
Pneumatic Ports |
Inlet, Outlet, Exhaust and Pilot Signal |
|
Control Function |
Automatic Pressure-Dependent Air Transfer |
|
Lock-Up Application |
Available Through Appropriate Exhaust Port Configuration |
|
Working Medium |
Clean, Dry Instrument Air |
|
Related Models |
78-80S, 08-80S, 08-80H |
|
Related Equipment |
Masoneilan BR200, 78-40 |
|
Condition |
New |
|
Warranty |
1 Year |
Key Features
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High-capacity three-way pneumatic transfer valve for industrial actuator protection.
-
Integrated floating-ball pilot valve for automatic pressure-dependent switching.
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Adjustable switching pressure range of 100–700 kPa.
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Maximum body operating pressure of 17.2 bar for appropriately rated applications.
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High pneumatic flow capacity, with Cv 4.5 for supply and Cv 5.0 for exhaust.
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Automatically switches pneumatic flow when signal pressure falls below the preset threshold.
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Supports pneumatic air-failure protection in compatible control valve assemblies.
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Can be configured for lock-up service when the application requires actuator pressure retention.
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Durable aluminium alloy housing in the standard configuration.
-
Optional 316L stainless steel construction for suitable corrosive industrial environments.
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Available with Rc or NPT pneumatic connection configurations.
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Can work with additional 08-80H transfer valves through a shared pilot signal arrangement.
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Mechanical pneumatic operation without an independent electrical power source.
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Suitable for integration with compatible valve positioners, actuators and pneumatic control accessories.
-
Designed for industrial process control and equipment maintenance applications.
Typical Applications
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Industrial pneumatic actuator protection
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Control valve air-failure switching
-
Pneumatic actuator lock-up arrangements
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Oil and gas production facilities
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Chemical and petrochemical processing plants
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Petroleum refining installations
-
Power generation and utility facilities
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Industrial manufacturing and process automation
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Control valve pneumatic circuits
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Instrument air supply switching
-
Automated flow and pressure control systems
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Industrial plant safety and maintenance systems
Shipping & Support
-
Fast dispatch – Australia & Worldwide Shipping
-
Technical assistance available
-
1-year warranty
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