5-Valve Manifolds for DP Transmitters

A 5-valve manifold combines two isolation (block) valves, one equalizing valve and two vent/bleed valves into a single body. That lets an operator isolate, equalize, vent and calibrate a differential-pressure transmitter without breaking the impulse lines. Crestflo builds five-valve manifolds in 316/316L stainless steel and a full range of duplex and high-nickel alloys, in direct-mount or remote-mount configurations. They're rated up to 10,000 psi, and every unit gets 100% seat and shell leak testing, a heat/lot number stamped on the body, and EN 10204 MTC 3.1 certification as standard. Manifolds ship either from ready stock for standard items or made to order, with delivery in 6-8 weeks.

One clarification before anything else: manifold on this page means an instrument valve manifold, used for differential-pressure measurement. Nothing else. Not an exhaust manifold, not a PEX or plumbing manifold, not a lawn-sprinkler or irrigation manifold.

This product goes by several names: a five-valve manifold, a 5 valve manifold, a 5-way valve manifold, a 5-way manifold, a manifold valve 5-way, an H-type five-valve manifold, a DP transmitter manifold, a differential-pressure manifold, and a block-and-bleed (5-valve) instrument manifold. Quite a list. When placing an order, buyers usually spell out three things: the mounting style (direct-mount or remote-mount, flange-to-flange or pipe-to-flange), the body pattern (H-pattern or T-pattern, coplanar or traditional flange), and the transmitter flange pattern. That last one follows IEC 61518, with 2.125-inch / 54 mm bolt spacing.

What Is a 5-Valve Manifold?

A 5-valve manifold is the block that sits between a differential-pressure (DP) transmitter and its high- and low-pressure impulse lines. Five valves make up the assembly. Two are isolation (block) valves, one on the high-pressure leg and one on the low, and they cut the transmitter off from the process entirely. A third, the equalizing valve, ties the two legs together so the pressure across the DP cell can be nulled out. The remaining pair are vent/bleed valves; they drain trapped pressure and give the technician dedicated points for calibration and testing. Add those two vent valves to a standard three-valve setup, and a technician can bleed each side of the cell to atmosphere, feed in a calibration signal, and check zero and span safely. That's why gas service, hazardous locations and high-integrity DP applications call for the five-valve design specifically. The manifold itself is an assembly, not a single grade of steel, so alloy designations don't apply to it as a whole. They belong to the body and trim materials instead.

5-Valve Manifold Valve Arrangement: 2 Block + 1 Equalize + 2 Vent/Bleed

The five valves and what each one does line up exactly with the isolate, equalize, vent, calibrate procedure.

The single equalizing valve goes by another name too: the equalizer valve. Each vent or bleed valve is sometimes called a drain valve. Same parts, just different labels depending on which spec sheet or datasheet you're reading. It's the two vent/bleed valves that separate a five-valve manifold from a three-valve one. They give the technician a controlled path to atmosphere on each side of the DP cell, which means the transmitter can be zeroed, span-checked, and safely depressurized right where it sits.

How a 5-Valve Manifold Works: Operation Sequence: Isolate, Equalize, Vent & Calibrate

The diagram below labels each of the five valves and shows where they sit between the DP transmitter and the high- and low-pressure impulse legs. Both the 5 valve manifold operation and the 5 way manifold valve operation follow those labeled positions.

``` DP TRANSMITTER (high side | low side) ┌──────────────────────┐ │ HP ● ● LP │ └────┬──────────────┬────┘ Vent/bleed ─▷◁─ ─▷◁─ Vent/bleed valve (HP) │ │ valve (LP) │ ─▷◁─ Equalizing valve │ (links HP & LP legs) │ │ Block/ ─▷◁─ ─▷◁─ Block/ isolation │ │ isolation valve (HP) │ │ valve (LP) ┌───┴────┐ ┌────┴───┐ │ HP tap │ │ LP tap │ ← process impulse lines └────────┘ └────────┘ ```

Figure: 5-valve manifold diagram, a labeled valve-arrangement diagram showing the two block (isolation) valves, one equalizing valve and two vent/bleed valves between the DP transmitter and the HP/LP impulse legs.

Crestflo manifolds keep both block valves open during normal operation, with the equalizing valve and both vents shut. That way the transmitter reads the actual differential across the process.

Calibrating or pulling the transmitter is a different matter, and the sequence exists to keep the DP cell from over-ranging. Start by closing both block valves. Then open the equalizing valve, which lets both sides of the cell see the same pressure and drives the differential to zero. From there, crack the vent and bleed valves to release trapped pressure, and only then apply the calibration signal.

Putting the loop back in service means running that sequence backward: close the vents first, then the equalize valve, then open the blocks. Order matters here for a real reason. Open the equalize valve before closing a block, and you'll slam full line pressure onto one side of the cell.

Crestflo manifolds use a non-rotating stem tip. It seals against the seat without spinning, which protects the seat finish and keeps shut-off repeatable cycle after cycle.

For the complete procedure, along with the thinking behind 2-, 3- and 5-valve designs, see the 2-valve vs 3-valve vs 5-valve manifold guide.

5-Valve Manifolds for DP, Flow, Level & Pressure Transmitters

Engineers specify the five-valve manifold for differential-pressure transmitters: measuring flow across an orifice or venturi, liquid level by hydrostatic head, and gauge or differential pressure. It's the right call whenever a procedure demands dedicated vent and calibration points, which usually means gas flow, hazardous media, and high-integrity loops. The manifold bolts to transmitters built to the IEC 61518 flange pattern, the 2.125-inch (54 mm) bolt spacing found across most common DP transmitter families. That means it fits directly to the process flange on the majority of flow and level cells. On the RFQ, list the transmitter model, flange pattern, and your preferred mounting, and the manifold will be supplied to match. Pattern and bolt dimensions follow the applicable standard, and they can be adjusted to whatever the job requires.

Direct-Mount vs Remote-Mount 5-Valve Manifolds

What sets the two mounting classes apart is how the manifold connects the transmitter to the impulse lines.

Coplanar bodies put both process ports on one plane, giving you a lower, more compact stack. Traditional bodies keep the process connections in line with the transmitter instead. You'll want direct-mount for the tightest, lowest-leak hookup. Remote-mount is the choice when the transmitter needs to sit clear of the process tap.

5-Valve Manifold Connections, Threads & Port Sizes

Process and instrument connections come as NPT threaded ends to ASME B1.20.1, or as flanged, socket-weld, butt-weld, or tube-fitting/compression ends, in imperial or metric. Instrument-side and process-side ports usually run 1/4-inch to 1/2-inch on DP manifolds. The equalize valve links the two block legs, and vent/bleed ports are tapped off each side of the cell. Thread, flange, and OD dimensions follow the applicable standard. They can be customized to requirement.

Tube-end manifolds take hardened or non-hardened ferrules, depending on what the job calls for. Need a drop-in replacement for an existing setup? Request your Swagelok®, Parker® or Anderson Greenwood® cross-reference and specify size, mounting and material.

5-Valve Manifold Pressure Rating, Temperature Limits & Testing

Crestflo instrument manifolds carry a cold working pressure rating of up to 10,000 psi. The certified figure for any given model depends on body style, material and temperature. Pressure-temperature basis follows ASME B16.34, and it can be tailored to your requirement.

Maximum service temperature isn't set by the body alloy. It's the packing and seal material that decide the limit. The values below are the commonly published continuous-service figures for each seal, and Crestflo supplies packing matched to your service.

Every manifold gets a 100% seat and shell leak test, no exceptions. Beyond that, testing covers hydraulic proof, burst and impulse work, pneumatic checks, thermal cycling and vibration, plus positive material identification (PMI) to confirm the alloy. We handle non-destructive testing in-house. Destructive testing goes out to laboratories accredited to ISO/IEC 17025, and third-party inspection can be arranged on request. Every body carries a heat/lot number, and an EN 10204 MTC 3.1 certificate comes standard, with 3.2 available on request.

5-Valve Manifold Materials: 316 Stainless, Duplex 2205, 6Mo & High-Nickel Alloy

Manifold bodies and trim come machined from bar stock or forged, in stainless, duplex, super-austenitic (6Mo) and nickel alloys. No brass. Each grade below links to its material page. The manifold itself is offered only in instrumentation form, not as bar, plate or mill product.

We supply sour-service material options to NACE MR0175 / ISO 15156. Finishes run the gamut: material finish, electropolish, passivation, and silver anti-galling plating, all customizable to your requirement. Take a look at the full range of instrumentation manifold materials.

2-Valve vs 3-Valve vs 5-Valve Manifold: Which to Choose

Take a 3-valve manifold and add two vent or bleed valves, and you get a 5-valve setup. Those extra valves create dedicated vent points, which makes depressurizing safer and allows in-line calibration. A 3-valve manifold only isolates and equalizes. A 2-valve unit, meanwhile, handles single-line gauge and pressure duty. For the complete decision logic, see the 2-valve vs 3-valve vs 5-valve manifold guide. The trade-off against a single-block design is covered in monoflange vs manifold.

Standards, Certifications & Traceability

Crestflo holds ISO 9001, ISO 14001, ISO 45001 and PED certification. Five-valve manifolds meet the standard approvals expected of instrumentation valves. ASME B16.34 governs design and pressure-temperature basis. The applicable API testing standards (API 598 / API 602) cover shell and seat testing. ASME B1.20.1 applies to NPT threads, and NACE MR0175 / ISO 15156 covers sour-service material options. Every manifold carries a heat/lot number marked on the body and ships standard with an EN 10204 MTC 3.1 certificate; MTC 3.2 with third-party endorsement is available on request. Certificates are held in our quality system, and content pages state conformance rather than certificate numbers. Datasheets and CAD models are available to customers on request.

Replacing Swagelok, Parker & Anderson Greenwood 5-Valve Manifolds

Crestflo manifolds are built for dimensional interchange with the common instrument-manifold brands, including the DP-transmitter manifolds specified alongside Rosemount, Yokogawa, AS-Schneider and Ashcroft cells. Each one is qualified by test to ASME B16.34 and the applicable API standards rather than by catalog assertion. Skip the fixed part-number chart: request your part-number cross-reference, and our engineering team will send back the equivalent for your existing manifold. Swagelok®, Parker®, Anderson Greenwood®, Hoke®, Rosemount®, Yokogawa®, AS-Schneider® and Ashcroft® are trademarks of their respective owners. Crestflo isn't affiliated with or endorsed by any of them. Parts are interchange/equivalent, not "compatible" or "intermix."

5-Valve Manifold Applications & Industries

Five-valve manifolds handle differential-pressure flow, level and pressure measurement. They're purpose-built for gas and hazardous service, where dedicated vent and calibration points aren't optional. You'll find them across oil and gas operations, spanning upstream, midstream and refining, in petrochemical and chemical plants, on offshore and subsea facilities, throughout power generation and nuclear sites, and in LNG and cryogenic service. Wherever a DP cell has to be isolated, equalized, vented and zeroed, with full material traceability behind it, this is the equipment doing the work.

Why Buy Crestflo 5-Valve Manifolds

Crestflo is the instrumentation division of a four-decade-old export house recognized by the Government of India, with a proven track record delivering into the Middle East. That's established heritage standing behind a focused new manufacturing brand. For US buyers, the offer is simple:

• Drop-in dimensional interchange for Swagelok®, Parker® and Anderson Greenwood® manifolds. Request a cross-reference from Crestflo and you won't need to re-engineer the hook-up.
• Ready stock for standard items, made-to-order for specials, 6 to 8 week delivery. Compare that to the 20-plus-week lead times common among the major suppliers.
• Full alloy breadth: 316 through Duplex, 6Mo, Inconel, Monel and Hastelloy. Every manifold gets 100% seat and shell leak testing before it ships.
• Small MOQ and private-label programs for OEMs and distributors, with kitting to print.
• ISO 9001 / 14001 / 45001 and PED certified, MTC 3.1 and heat-number traceability on every unit.

Indian-origin material as standard, though US or European melt is available on request with full traceability for TAA- and DFARS-driven projects.

We Engineer Confidence, request a quote, request a sample, or become a distributor. US sales: sales@crestflousa.com · +1 346 594 9005 · Houston, TX.

5-Valve Manifold FAQs

Related Pages

• All instrumentation valves
• 2-valve manifold · 3-valve manifold
• 2-valve vs 3-valve vs 5-valve manifold guide
• Monoflange valve · Double block-and-bleed valve
• ASME B16.34 valve design basis
• Manifold valves supplier, Texas

Reviewed by the Crestflo Engineering Team