QFF3 Five Valve Manifold

QFF3 Five Valve Manifold

The SIYelectric QFF3 Five Valve Manifold is designed for differential pressure instrument installation, isolation, equalizing, bleeding, venting, and calibration in industrial process measurement systems.

A typical QFF3 five valve manifold combines two block valves, one equalizing valve, and two vent or bleed valves into one compact manifold body. The two block valves isolate the high-pressure and low-pressure sides from the process, the equalizing valve balances pressure across the instrument, and the vent valves allow controlled pressure release, draining, or calibration connection.

This manifold is commonly used with differential pressure transmitters, differential pressure gauges, pressure transmitters, pressure gauges, and other process instruments for flow measurement, level measurement, filter differential pressure monitoring, pressure difference measurement, and industrial process control.

Applications

Oil & Gas Industry

Differential pressure and process pressure monitoring
Used in drilling, production, pipeline transmission, gas processing, and refinery systems where pressure or differential pressure instruments are required for high-pressure liquids and gases.

Flow measurement support
Suitable for differential pressure flow measurement loops using orifice plates, flow nozzles, venturi tubes, and other primary flow elements in pipelines, refineries, and process units.

Isolation, equalizing, venting, and draining
The QFF3 five valve manifold allows operators to isolate both pressure sides, equalize pressure across the instrument, vent trapped pressure, drain residual media, and perform calibration or maintenance more safely.

Chemical and Petrochemical Plants

Process differential pressure measurement
Applied in reactors, pumps, filters, distillation columns, storage tanks, dosing systems, and chemical pipelines where stable pressure or differential pressure monitoring is required.

Safer maintenance in harsh conditions
The manifold helps isolate instruments from corrosive, toxic, flammable, high-pressure, or high-temperature media before inspection, replacement, zero checking, or calibration.

Power Generation

Steam and water systems
Used in boiler systems, turbine auxiliary systems, feedwater lines, condensate systems, and steam pipelines where DP transmitters or gauges are used for flow, level, and pressure difference measurement.

Instrument protection and calibration
The five valve structure helps protect the instrument during commissioning, shutdown, zero adjustment, venting, routine inspection, and calibration work.

Pharmaceutical and Biotechnology

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

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

Water Treatment and Distribution

Flow and differential pressure monitoring
Used in filtration systems, pumping stations, membrane systems, treatment units, desalination systems, and distribution pipelines to support pressure, flow, and differential pressure measurement.

Filter pressure drop measurement
Suitable for monitoring differential pressure across filters, membranes, and treatment equipment, helping operators identify clogging, fouling, or maintenance requirements.

HVAC Systems

Differential pressure measurement
Applied in chilled water, heating water, air handling units, filter sections, pump systems, heat exchangers, and refrigerant-related systems where pressure difference needs to be monitored.

Maintenance isolation and calibration
The manifold allows technicians to isolate, equalize, vent, and calibrate the instrument locally, helping reduce system interruption during service work.

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 or differential pressure monitoring.

Compact instrument connection
The QFF3 manifold body supports instrument mounting, pressure balancing, pressure release, calibration, and pressure line management in experimental or small-scale process systems.

Advantages

• QFF3 five valve structure supports differential pressure transmitter and gauge installation.
• Two block valves, one equalizing valve, and two vent or bleed valves provide complete isolation, pressure balancing, venting, and calibration functions.
• Suitable for DP transmitters and DP gauges used in flow, level, filter, and process monitoring applications.
• Compact manifold body helps simplify instrument piping and reduce potential leakage points.
• More convenient zero checking and calibration compared with a basic three valve manifold.
• Non-rotating stem design helps reduce seat wear and extend 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 longer service life.
• Precision-machined valve body helps ensure accurate dimensions, smooth operation, and consistent sealing performance.