Double Block and Bleed Monoflange Valve Manifold

Double Block and Bleed Monoflange Valve Manifold

The Double Block and Bleed Monoflange Valve Manifold is designed for safe instrument isolation, pressure venting, and maintenance in industrial process measurement systems.

Unlike a simple single block and bleed valve, a typical double block and bleed monoflange manifold integrates two isolation valves and one bleed valve into one compact flanged body. This structure provides a higher level of process isolation, allowing operators to shut off the process on both sides of the bleed point, release trapped pressure, and safely maintain pressure transmitters, pressure gauges, pressure switches, and other field instruments.

The monoflange design reduces the number of separate fittings and threaded connections, helping improve installation safety, reduce potential leakage points, and simplify instrument mounting in demanding applications such as oil & gas, petrochemical, power generation, chemical processing, water treatment, and general process industries.

Applications

Oil & Gas Industry

High-pressure instrument isolation
Used in drilling, production, pipeline transmission, gas processing, and refinery systems where pressure instruments must be safely isolated from high-pressure liquids and gases.

Pressure and flow measurement support
Suitable for instrument connections related to pressure monitoring, flow measurement, and process control in pipelines, separators, compressors, and refinery units.

Double isolation and pressure venting
The double block and bleed structure allows operators to isolate the process line, vent trapped pressure, drain residual media, and perform maintenance or calibration more safely in high-pressure service.

Chemical and Petrochemical Plants

Process pressure measurement
Applied in reactors, pumps, dosing systems, distillation columns, storage tanks, and chemical pipelines where reliable instrument isolation is required.

Safer maintenance in hazardous media
The monoflange manifold helps reduce maintenance risk when instruments are installed on corrosive, toxic, flammable, high-pressure, or high-temperature process lines.

Power Generation

Steam and water systems
Used in boiler systems, turbine auxiliary systems, feedwater lines, condensate systems, and steam pipelines where pressure gauges or transmitters require secure isolation.

Instrument protection and calibration
The double isolation design helps protect field instruments during commissioning, shutdown, routine inspection, and calibration work.

Pharmaceutical and Biotechnology

Clean utility and auxiliary process lines
Suitable for auxiliary pressure measurement in water systems, clean utility lines, fermentation equipment, mixing systems, and process skids.

Clean process isolation
For hygienic or sanitary applications, the material, connection type, sealing structure, and surface finish should be selected according to the actual process medium and cleaning requirements.

Water Treatment and Distribution

Pressure monitoring in water systems
Used in filtration units, pumping stations, treatment equipment, desalination systems, and distribution pipelines to support stable pressure measurement and process control.

Convenient instrument maintenance
The monoflange manifold allows local isolation and depressurization of pressure instruments, making calibration, replacement, and troubleshooting easier without shutting down a large pipeline section.

HVAC Systems

Heating and cooling system pressure measurement
Applied in chilled water, heating water, refrigerant, and ventilation-related systems where pressure gauges or transmitters require reliable isolation and venting.

Reduced maintenance downtime
The compact double block and bleed design provides a practical service point for technicians, helping improve maintenance efficiency in complex HVAC systems.

Laboratories and Research Facilities

Controlled gas and liquid pressure lines
Used in laboratories, pilot plants, test benches, and research systems where gases or liquids require stable pressure monitoring and safe isolation.

Compact instrument connection
The monoflange structure supports instrument mounting, pressure release, calibration, and process line management in experimental or small-scale process systems.

Advantages

• Double block and bleed design provides two-stage isolation and controlled pressure venting.
• Monoflange compact body reduces separate fittings and helps minimize potential leakage points.
• Suitable for pressure gauges and transmitters in high-pressure and critical process applications.
• Non-rotating stem design helps reduce seat wear and supports longer valve service life.
• Improved locking gland structure helps maintain stable stem operation and reliable sealing.
• 100% pneumatic pressure testing before shipment helps verify sealing performance.
• Tested at 1.5 times the design pressure to support reliable operation in demanding industrial applications.
• Hastelloy tip available as standard configuration for improved corrosion resistance and extended service life.
• Precision-machined valve body helps ensure accurate dimensions, smooth operation, and consistent sealing performance.