An instrument valve assembly that combines a high-pressure block valve, a low-pressure block valve, and an equalizing valve in one body, used to isolate and zero-calibrate a differential pressure transmitter without removing it from the line.
3 Way Manifold Valves
It is used to ensure that the capsule is not over-ranged.
Freture Techno manufactures 3 Way Manifold Valves manufacturers in India. It is a compact instrument assembly built for differential pressure service. It combines a high-pressure block valve, a low-pressure block valve, and an equalizing valve in a single body, letting technicians isolate a pressure transmitter, gauge, or switch from the process line and zero it safely without removing the instrument or interrupting flow. The equalizing valve is what protects the transmitter's sensing capsule from being over-ranged during start-up, shutdown, or calibration a real risk if only one side of the instrument is pressurized while the other sits at atmospheric pressure.
Available in S, T, H, and Coplanar configurations with flanged, butt-weld, or screwed-end connections, our 3 way manifold valves are built to MSS SP-99 in sizes from 15 NB to 300 NB and pressure classes up to 6,000 PSI, for oil & gas, petrochemical, and power plant instrumentation.
What Is a 3 Way Manifold?
A 3-way manifold valve, commonly called a 3 valve manifold, is an instrumentation valve assembly designed specifically for differential pressure measurement systems. It integrates three precision valves into a single compact body to control and balance pressure between the high- and low-pressure sides of an instrument.
Valve Configuration & Function
A standard includes:
- High-Pressure Block Valve – isolates the high-pressure side
- Low-Pressure Block Valve – isolates the low-pressure side
- Equalizing Valve – balances pressure between both sides
This configuration protects the transmitter during start-up, shutdown, and maintenance.
In normal operation, both block valves stay open and the equalizer stays closed, so the transmitter reads live differential pressure. To zero or calibrate the instrument, one block valve is closed and the equalizer is opened, bringing both sides of the transmitter to the same pressure — protecting the sensing capsule from an over-range condition that could otherwise damage it. This configuration is what lets a technician safely isolate and check a transmitter during start-up, shutdown, or routine maintenance without shutting the process down.
Types
- S Type (3VMS1 / 3VMS2) — in-line, direct-mount block arrangement with 2 isolation valves and 1 equalizer. (Confirm the distinction between 3VMS1 and 3VMS2 for the page copy — currently listed as identical.)
- T Type (3VMT) — the same 2 isolation/1 equalizer configuration in a T-pattern body, typically used for remote-mount installations.
- H Type (3VMH) — 2 isolation, 1 equalizer valve in an H-pattern block, commonly used for side-mounted DP transmitters.
- Coplanar Type (3VMS CP1) — matches the coplanar flange pattern used on Rosemount-style and compatible transmitters, for direct mounting without extra adapters.
All types: MSS SP-99 design standard, DIN EN 61518 or screwed-end instrument connections, 15 NB–300 NB, 150 PSI–6,000 PSI class.
Description | Features |
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TYPE: 3 valve (S / T / H /Coplanar) Manifold End Connection: Flange / Butt Weld Size: 15 NB - 300 NB Pressure Rating: 150PSI to 6,000PSI Temperature Range: -7Deg C to 280 Deg C Body Materials: Stainless Steel / Carbon Steel / Alloys Design Standard: ISO 17292 rev 2004, B16.5 Face to Face: ASME B16.10 Rev 2009 Safety: NACE MOR 0175 , BS/EN 10204-3.1 REV 2004, API 598 Rev 2009, API-607 |
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Explore Types Of 3 Way Manifold
3VMS1
3VMS2
3VMT
3VMS CP1
3VMH
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FAQ’s
Have a question before you buy our products? Take a look at the FAQs below.
If you don’t find the answer you’re looking for, get in touch with us here.
- What is a 3 way manifold ?
- How does a 3 way manifold work?
In normal operation both block valves stay open and the equalizer stays closed. To calibrate, one block valve closes and the equalizer opens, balancing pressure across the transmitter and protecting its sensing capsule from an over-range condition.
- What's the difference between a 3 way and a 5 way manifold ?
A 3 way manifold gives isolation and equalization only. A 5 way manifold adds two vent/drain valves, so the transmitter can also be depressurized and safely removed for service.
- What materials are Freture's 3 way manifold valves available in?
Stainless steel, carbon steel, and alloy steel bodies, selected against the process fluid, temperature, and any sour-service (NACE MR0175) requirement.
- What pressure and temperature range do they cover?
150 PSI to 6,000 PSI, from -7°C to 280°C, in sizes from 15 NB to 300 NB.
- What standards govern the design?
MSS SP-99 for design, ASME B16.10 for face-to-face dimensions, API 607 for fire-safe qualification, API 598 for testing, and NACE MR0175 / BS EN 10204-3.1 for sour-service and material certification.
- Which industries use 3 way manifold ?
Oil & gas, petrochemical and refining, power generation, and chemical processing — anywhere a DP transmitter needs in-place zero calibration without a process shutdown.
- Can a 3 way manifold be used with any transmitter brand?
The Coplanar type matches the coplanar flange pattern used on Rosemount-style transmitters. S, T, and H types use standard flanged, butt-weld, or screwed connections compatible with most differential pressure transmitters, gauges, and switches.
- How do I choose between S, T, H, and Coplanar types?
The choice comes down to mounting orientation and your transmitter's flange pattern direct-mount vs. remote-mount, and whether the transmitter uses a coplanar or traditional flange. Our technical team can confirm the right type against your instrument datasheet.
- Why buy from Freture Techno?
Manifold valves manufactured and tested in-house to MSS SP-99, ASME B16.10, API 607, and API 598, with NACE MR0175 material options and BS EN 10204-3.1 documentation for oil & gas, petrochemical, and power plant specifications.
Industries where 3 Way Manifold is used
Chemical Manufacturing
Oil & Gas Refineries
Pharmacutical Industry
Water treatment Industry
Food & Beverage Industry
Applications
Flow Distribution: They are used to distribute the flow of fluids from a single inlet to two separate outlets or from two inlets to a single outlet, enabling versatile fluid distribution in various industrial processes.
Pressure Measurement: They facilitate pressure measurement by allowing the connection of pressure transmitters to multiple process lines, providing accurate pressure readings for monitoring and control purposes.
Fluid Mixing: They are employed to mix fluids from different sources by combining them into a single outlet, ensuring uniform mixing and blending of fluids in chemical processing, water treatment, and other industries.
Level Monitoring: They are utilized for level monitoring in tanks and vessels by connecting level sensors to different ports of the manifold, enabling precise monitoring and control of fluid levels.
Process Control: They play a crucial role in process control systems, allowing for the diversion, isolation, or combination of fluid streams to regulate flow rates, pressure, and temperature in industrial processes.
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