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NAI-LOK 3/4 Inch Alloy 400 Monoflange Class 2500 Single Block and Bleed Instrument Manifold Valves
The NAI-LOK 3/4 Inch Alloy 400 Monoflange Class 2500 Single Block and Bleed Instrument Manifold Valves is designed for high-pressure and corrosive service in critical instrumentation systems. Manufactured from Monel (UNS N04400) - excellent corrosion resistance in harsh environments, it provides exceptional resistance against pitting, crevice, and chloride-induced stress corrosion cracking, making it ideal for offshore, oil & gas, and chemical applications.
The compact monoflange design integrates block, isolate, and bleed functions into a single forged body, reducing installation space and minimizing leak paths. With a Class 2500 pressure rating, this valve ensures reliable sealing performance, enhanced safety, and long service life under demanding operating conditions.
Typical applications include oil & gas pipelines, petrochemical plants, offshore platforms, and power generation systems where durability and corrosion resistance are critical
Compact DBB Design:
Integrated double block (2 isolation valves) and one bleed valve in a single body
Body Material:
Monel (UNS N04400) - excellent corrosion resistance in harsh environments
Pressure Rating:
Class 150 to Class 2500 (up to 6000 psi depending on configuration)
Inlet Connection:
ASME B16.5 flanged inlet, available in sizes from 1/2" to 2"
Outlet Connection:
Standard 1/2" NPT female
Bleed Port:
1/2" NPT female with hex plug included as standard
Needle Valve:
Precision needle valve with PTFE packing (Graphite optional for high temp)
Testing:
100% factory-tested with nitrogen or helium to ensure gas-tight integrity
Offshore oil & gas and subsea platforms
Chemical injection and analyzer systems
Pressure transmitter isolation and sampling
Natural gas and corrosive media process lines
Power generation and utility pipelines
Alternate materials: Hastelloy, Inconel, Duplex, Stainless Steel
Pressure class: 1500 to 2500
End connections: NPT, Flange
Packing materials: PTFE (standard), graphite (optional)
OEM logo, label, and packaging services
| Parameter | Specification |
|---|---|
| Product Name | Monoflange Double Block and Bleed Valve |
| Size | 1/2 Inch (other sizes on request: 3/4", 1") |
| Pressure Rating | Class 1500 (up to 420 bar / 6000 psi approx.) |
| Material | Forged Stainless Steel 316 / 316L (other alloys available: Duplex, Super Duplex, Monel, Alloy HC-276) |
| Connection Ends | NPT, BSPP, Flanged (Class 150 - 2500) |
| Design Standard | ASME / ANSI |
| Operation Type | Double Block and Bleed (2 isolation + 1 vent) |
| Temperature Range | -29°C to +250°C (-20°F to +480°F) |
| Features | Compact design, leak-proof performance, easy installation, forged body construction |
| Applications | Oil & Gas, Petrochemical, Refinery, Offshore, Power Generation, Instrumentation Systems |
| Material / Alloy | UNS Number | Main Characteristics |
|---|---|---|
| Hastelloy® C276 | UNS N10276 | Excellent resistance to strong oxidizers, chlorine, and a wide range of chemical environments. |
| Hastelloy® B2 | UNS N10665 | Outstanding resistance to hydrochloric acid at all concentrations and temperatures. |
| Hastelloy® B3 | UNS N10675 | Better thermal stability and corrosion resistance than B2, especially against hydrochloric acid. |
| Hastelloy® C22 | UNS N06022 | Superior resistance to oxidizing aqueous media, including wet chlorine and nitric acid. |
| Inconel® 600 | UNS N06600 | Excellent resistance to oxidation and corrosion, good strength at high temperatures. |
| Inconel® 625 | UNS N06625 | High strength and outstanding fatigue and thermal-fatigue resistance, excellent corrosion resistance. |
| Incoloy® 800H / 800HT | UNS N08810 / N08811 | Good strength and oxidation resistance at elevated temperatures, used in heat exchangers and furnace components. |
| Monel® 400 | UNS N04400 | High strength and excellent resistance to seawater, acids, and alkalis. |
| Alloy 20 | UNS N08020 | Excellent resistance to sulfuric acid, used in chemical and petrochemical industries. |
| Alloy 254 SMO® (6Mo) | UNS S31254 | Superior resistance to pitting, crevice corrosion, and chloride stress corrosion cracking. |
| Super Duplex® 2507 | UNS S32750 | High mechanical strength and resistance to pitting, crevice corrosion, and stress corrosion cracking. |
| Duplex 2205 | UNS S32205 | Balanced austenitic-ferritic structure, good resistance to chloride stress corrosion cracking. |
| 904L Stainless Steel | UNS N08904 | Excellent resistance to strong reducing acids (sulfuric acid), superior to 316L in corrosion performance. |
| Alloy C4 | UNS N06455 | Excellent resistance to strong oxidizing agents, even at elevated temperatures. |
| Alloy 825 (Incoloy® 825) | UNS N08825 | Good resistance to sulfuric and phosphoric acids, widely used in chemical processing. |
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