Oliver Monoflange Valves Distributor in India

Priminox Overseas is the exclusive distributor of Oliver Monoflange Valves in Mumbai, India. We supply compact valve assemblies that combine primary isolate, secondary isolate, and bleed functions into a single forged or barstock body bolted directly onto ASME B16.5 flanges. Our stock covers Gauge Block Monoflange Valves and Slimline Primary Isolate Valves (also referred to as Slimline Monoflanges) in Block, Block and Bleed, and Double Block and Bleed configurations. Available body materials include 316 stainless steel, ASTM A350 LF2 carbon steel, Duplex F51, Super Duplex UNS S32760, Monel 400, and Ferralium 255, with flange ratings from ASME Class 150 to Class 2500.

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Explore the Full Range of Oliver Monoflange Valves

We hold two Oliver monoflange families, both engineered to replace bulky traditional instrument hook-ups with a single forged or barstock body that reduces weight, leak paths, and on-site welding.

Oliver Gauge Block Monoflange Valves

Function: Works downstream of a pre-installed primary isolate valve to provide compact instrument double block and bleed valving.
Configurations: Block (BK), Block and Bleed (BB), Double Block and Bleed (DBB).
Valve Pattern: Needle pattern primary isolate, secondary isolate, and bleed valves. Standard or heavy duty needle valves available depending on the duty, with Heavy Duty bonnets available as the HD option.
Body Materials: 316 stainless steel (BS970-316S11 barstock / ASTM A182 F316 forged), 080M40 carbon steel barstock (EN8), ASTM A350 LF2 forged carbon steel, Duplex F51 (UNS S31803), Super Duplex (UNS S32760), Monel 400, Ferralium 255.
Flange Sizes: 1/2", 1 1/2", 2", and 3".
Flange Classes: ASME 150, 300, 600, 900, 1500, and 2500.
Flange Faces: Ring Type Joint (RTJ), Spiral finish Raised Face (RF), Smooth spiral finish Raised Face (SRF), to ASME B16.5.
Instrument and Vent Connections: 1/4" (standard vent), 3/8", 1/2" (standard process/instrument), 3/4", and 1" in NPT, BSP parallel (BS2779), BSP taper (BS21), compression fitting, lap joint tube adaptor, or swivel gauge adaptor.
Sealing: PTFE packing standard, graphite packing available for high temperature service.
Options: Anti-tamper on vent (ATV), Firesafe to API 607 / API 6FA (FS), Heavy Duty bonnets (HD), Handle locking (HL), NACE MR-01-75 latest revision (NA).
Features: Dual instrument connections for vertical instrument mounting on either horizontal or vertical lines, multi-gauge ports, modular construction for installation after an existing primary isolate.

Oliver Slimline Primary Isolate Monoflange Valves

Function: Replaces the traditional primary isolate valve and instrument hook-up with one assembly that combines an outside screw and yoke (GOSY) primary isolate with secondary isolate and bleed.
Design Code: GOSY primary isolate designed to ASME VIII.
Configurations: Block (BK), Block and Bleed (BB), Double Block and Bleed (DBB), shown in the catalogue as a standard configuration with an outside screw and yoke needle primary isolate and inside screw and yoke needle valves for secondary isolate and bleed.
Body Materials: 316 stainless steel (BS970-316S11 barstock / ASTM A182 F316 forged), carbon steel barstock EN8, ASTM A350 LF2 forged carbon steel, Duplex F51 (UNS S31803), Super Duplex (UNS S32760), Monel 400, Ferralium 255.
Flange Sizes: 1/2", 1 1/2", 2", and 3".
Flange Classes: ASME 150, 300, 600, 900, 1500, and 2500.
Flange Faces: RTJ, RF, SRF, to ASME B16.5.
Process and Instrument Connections: 1/4" (standard vent), 3/8", 1/2" (standard process and instrument) in NPT (standard), BSP parallel pipe thread (BS2779-1986), BSP taper pipe thread (BS21-1985), compression fitting, lap joint tube adaptor, or swivel gauge adaptor.
Cold Service Option: Extended bonnets validated to Shell specification 77/300 down to -50°C (-58°F) at ASME Classes 600 and 2500.
Options: Anti-tamper on vent (ATV), Firesafe to API 607 and API 6FA (FS), Heavy Duty bonnets (HD), Handle locking (HL), NACE MR-01-75 latest revision (NA). First isolation outside screw and yoke valve available to NACE and Firesafe specifications.
Features: First isolation outside screw and yoke valve available to NACE and Firesafe specifications, dual instrument connections for vertical mounting, fewer leak paths and lower bending moments versus traditional hook-up.

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— Priminox Overseas at competitive prices

For competitive prices of Oliver Monoflange Valves, contact Priminox Overseas.

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Industries We Supply Oliver Monoflange Valves To

Oliver Monoflange Valves bring primary isolate, secondary isolate, and bleed into one flange-mounted unit, which is why operators in the following sectors specify them on pressure instrument take-offs:

Oil and Gas Production and Processing

Petrochemicals

Refining

LNG and Cold Service Plants

Offshore Topside Platforms

Power Generation

Renewable Energy and Offshore Wind

Hydrogen and Carbon Capture

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Oliver Valves Catalogue

Download the complete Oliver Valves product Catalogue with full specifications, dimensions, ordering codes, and material options for all product categories.

Download Oliver Valves Catalogue (PDF)

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Oliver Monoflange Valves – Sourcing and Technical Questions, Answered

The difference is where the primary isolation sits. The Gauge Block Monoflange works downstream of an existing primary isolate valve and handles only the instrument-side block and bleed, while the Slimline Monoflange replaces the primary isolate itself by integrating an outside screw and yoke first isolate with secondary isolate and bleed in one body.

Flange sizes are stocked from 1/2" up to 3" in ASME pressure Classes 150, 300, 600, 900, 1500, and 2500, with RTJ, RF, or SRF flange faces machined to ASME B16.5.

Body materials supplied include 316 stainless steel (BS970-316S11 barstock and ASTM A182 F316 forged), ASTM A350 LF2 forged carbon steel, Duplex F51 (UNS S31803), Super Duplex (UNS S32760), Monel 400, and Ferralium 255, with other grades available on application.

Yes, Oliver Slimline Monoflange Valves are supplied with extended bonnets validated to Shell specification 77/300 down to -50°C (-58°F), with seat leakage of zero and gland leakage within rate BH at ASME Classes 600 and 2500.

A single monoflange bolts directly onto the process flange in place of separately welded primary isolate, secondary isolate, and bleed valves, which cuts assembly weight, on-site welding, gusset plate requirements, and the number of potential leak points in the take-off.

All three configurations are offered across both the Gauge Block and Slimline ranges: Block (BK) for single isolation, Block and Bleed (BB) for single isolation with vent, and Double Block and Bleed (DBB) with two isolates and one vent.

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