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| Customization: | Available |
|---|---|
| Power: | Manual |
| Connection Mode: | Internal Thread |
| Shipping Cost: | Contact the supplier about freight and estimated delivery time. |
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NAI-LOK 1/2 Inch Class 300 Stainless Steel Block and Bleed Monoflange Valve for Instrumentation
Overview:
The NAI-LOK Monel Monoflange Double Block and Bleed Valve is engineered to provide safe, compact, and reliable isolation and venting for high-pressure instrumentation systems. Made from corrosion-resistant Monel alloy, it features a compact forged body with integrated dual isolation and a bleed function, reducing space, weight, and potential leak paths in process lines. This valve is ideal for offshore, chemical, and high-integrity applications.
The NAI-LOK Stainless Steel Class 300 Monoflange Instrument Valve 1/2 Inch Block and Bleed i
is designed for critical isolation in high-pressure instrumentation and process systems. Manufactured from high-quality forged stainless steel 316/316L, this compact monoflange integrates double block and bleed functions into a single body, reducing potential leak paths and saving installation space.
It is widely used in oil & gas, petrochemical, refinery, offshore platforms, and power generation industries, ensuring safe and reliable operation under extreme pressure and temperature conditions.
The valve features a Class 300 pressure rating, robust sealing, and easy maintenance, making it an ideal solution for modern instrumentation applications.
Compact DBB Design:
Integrated double block (2 isolation valves) and one bleed valve in a single body
Body Material:
Stainless Steel 316 - excellent corrosion resistance in harsh environments
Pressure Rating:
Class 1500 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 Block and Bleed Valve |
| Size | 1/2 Inch (other sizes on request: 1/2", 1") |
| Pressure Rating | Class 300 (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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