SS316 Monoflange Valve Single & Double Block and Bleed Dbb Valve Class 1500 1/2" for Oil & Gas Instrumentation
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Product Highlights
- Designed for instrumentation and pressure transmitter isolation systems in oil & gas applications
- Integrated monoflange design combines multiple valve functions in a compact single body
- Double Block and Bleed (DBB) structure ensures safe isolation, venting, and system protection
- Manufactured from SS316 stainless steel for excellent corrosion resistance and durability
- Pressure rating up to Class 1500 for high-pressure industrial applications
- Provides safe maintenance and calibration without system shutdown
- Compact design reduces leakage points and improves overall system safety
- Suitable for harsh offshore and onshore oil & gas environments
- Precision machined sealing surfaces ensure reliable leak-tight performance
- Ideal for pressure measurement, process control, and instrumentation systems
Product Attributes
- Customization
- Available
- Power
- Manual
- Connection Mode
- Internal Thread
- Model NO.
- Monoflange valve
- Material
- Stainless Steel
- Pressure
- High Pressure
- Standard
- Standard
- Media
- Oil, Gas, Water,Acid
- Media Temperature
- High Temperature
- Product Name
- Monoflange Valve / Dbb Valve
- Valve Type
- Single Block & Bleed / Double Block & Bleed
- Valve Material
- SS316 Stainless Steel
- Pressure Class
- Class 150-2500
- Connection Size
- 1/2 Inch
- Connection Type
- NPT / BSPP / BSPT / Flanged Optional
- Structure
- Integrated Monoflange Design
- Application
- Oil & Gas Instrumentation System
- Function
- Isolation, Venting & Pressure Control
- Industry
- Oil & Gas / Petrochemical / Process Control
- Transport Package
- Wooden Case
- Specification
- 1/2"-1"
- Trademark
- NAI LOK
- Origin
- China
- HS Code
- 8481804090
- Production Capacity
- 10000
- Package Size
- 30.00cm * 20.00cm * 15.00cm
- Package Gross Weight
- 4.000kg
Shipping
- Shipping Cost:
- Contact the supplier about freight and estimated delivery time.
Online Trading Protection
- Payment Guarantee
-
Platform-protected payments with refund support for eligible order issues.
- Platform Logistics
- Clearer shipment tracking with platform-supported logistics.
- Inspection Service
- Optional pre-shipment inspection for quality and quantity checks.
- After-Sales & Dispute Handling
- Platform-assisted dispute resolution, including refunds or returns when applicable.
Only orders placed and paid through Made-in-China.com Secured Trading are eligible for payment protection and the corresponding platform services.
Product Images of SS316 Monoflange Valve Single & Double Block and Bleed Dbb Valve Class 1500 1/2" for Oil & Gas Instrumentation
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SS316 Monoflange Valve Single & Double Block and Bleed Dbb Valve Class 1500 1/2" for Oil & Gas Instrumentation -
SS316 Monoflange Valve Single & Double Block and Bleed Dbb Valve Class 1500 1/2" for Oil & Gas Instrumentation -
SS316 Monoflange Valve Single & Double Block and Bleed Dbb Valve Class 1500 1/2" for Oil & Gas Instrumentation -
SS316 Monoflange Valve Single & Double Block and Bleed Dbb Valve Class 1500 1/2" for Oil & Gas Instrumentation -
SS316 Monoflange Valve Single & Double Block and Bleed Dbb Valve Class 1500 1/2" for Oil & Gas Instrumentation -
SS316 Monoflange Valve Single & Double Block and Bleed Dbb Valve Class 1500 1/2" for Oil & Gas Instrumentation -
SS316 Monoflange Valve Single & Double Block and Bleed Dbb Valve Class 1500 1/2" for Oil & Gas Instrumentation
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Product Description
NAI-LOK SS316 Monoflange Valve Single & Double Block and Bleed DBB Valve Class 1500 1/2" for Oil & Gas Instrumentation
The NAI-LOK 1/2 Inch Stainless Steel 316 Class 1500 Monoflange SBB DBB Marine Instrument Valve Manifolds is designed for high-pressure and corrosive service in critical instrumentation systems. Manufactured from stainless steel 316, 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 1500 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
Key Features:
-
Compact DBB Design:
Integrated double block (2 isolation valves) and one bleed valve in a single body -
Body Material:
Alloy 2507 / SS316 / SS316L forged body -
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
Applications:
-
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
Customization Options:
-
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, 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. |
| 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. |
About the Supplier
This supplier has been audited by TÜV Rheinland. Verify the report on the official TÜV Rheinland website with ID "MIC-ASI264759". Items marked "
" are certified.
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Company Profile
Established in 2000, NAI-LOK has made a name of itself in the list of top suppliers of in China. We focus on the production, research and development, sales of instrumentation valves and alloy valves. We have more than 20 years of precision valve manufacturing and 10 years of export experience.
Our strict control and management of the entire production process enables us to provide products that meet our customers' requirements for product safety, functionality and design at competitive prices, while ensuring the shortest lead times in the market.
We have the capability to manufacture and supply 4 different product categories, including:
1. General Instrumentation Valves and Fittings
2. High Purity & Ultra High Purity Products- NAI-LOK UHP PRODUCTS, Regulator, Bellows Valve, 3 PC high purity ball valve, Diaphragm Valve, Weld Fitting, Face seal Fitting, Gas Stick.
3. Hose & Tubing
4. Special Alloy Valves, fitting and tubings. Including material S31254 (6 Moly), Alloy 400, HC-276, C22, B3, Alloy 625, Duplex steel 2205 /2507 etc.
We hope there will be opportunities for cooperation.
About Our Factory & Business Background
-
Business Type
- Manufacturer/Factory & Trading Company
- Address
- 397 Damuqiao Road, Shaxi Town, Taicang City, Suzhou, Jiangsu, China
-
Terms of Payment
- LC, T/T
-
International Commercial Terms(Incoterms)
- FOB, CIF, CFR, EXW
- Average Lead Time
-
Peak Season Lead Time: within 15 workdays
Off Season Lead Time: one month -
Nearest Port
- Shanghai Port
-
Minimum Order Quantity
- 1 Piece
Our Production Capability & Technical Expertise
- Main Products
- Gas Delivery System, Ball Valve, Pressure Regulator, Alloy Valve, 2/3/5 Valve Manifold, Instrumentation Ball Valves, Sample Cylinder, Pipe & Tube Fittings, Needle Valve, Hose & Tubing
-
Inspection Type for Finished Products
- 100% inspection(Visual inspection & Function inspection)
-
Inspection Method for Finished Products
- Have instructions and uniformly followed
-
Customization Options
- Customization from Samples, Customization from Designs, Full Customization, Minor Customization, Flexible customization
-
Traceability of Raw Materials
- Yes
Our Industry Experience & Global Business Record
- Main Markets
- North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, Mid East, Eastern Asia, Western Europe
-
Repeat Buyers Choice
- 50%~80%
Our Certifications, Standards & Industry Recognition
-
Management System Certification
- ISO9001:2015, ISO14001
FAQ
- What is a monoflange valve used for?
- A monoflange valve is used in oil and gas instrumentation systems to isolate, vent, and control pressure in pressure transmitter and process measurement applications.
- What is the difference between a monoflange valve and a traditional manifold valve?
- A monoflange DBB valve combines multiple valve functions into one compact body, reducing leakage points and improving safety compared to traditional instrument manifold valve systems.
- What does DBB valve mean?
- DBB stands for Double Block and Bleed Valve, which provides dual isolation and venting functions for safe maintenance and pressure control in high pressure process systems.
- What material is used in the SS316 monoflange valve?
- This SS316 monoflange valve is manufactured from stainless steel 316 for excellent corrosion resistance, high strength, and long-term durability in harsh industrial environments.
- What pressure rating does this high pressure DBB valve support?
- This high pressure monoflange valve is designed for Class 1500 pressure applications, suitable for oil & gas, petrochemical, and instrumentation systems.
- Can this monoflange valve be used for pressure transmitter systems?
- Yes, this instrument monoflange valve for pressure transmitters is widely used in pressure measurement, DP transmitter, and instrumentation control systems.
- Is this double block and bleed valve suitable for offshore oil and gas applications?
- Yes, the SS316 double block and bleed valve is suitable for offshore and onshore oil & gas systems due to its corrosion-resistant construction and compact high pressure design.
- Where is this oil and gas monoflange valve commonly used?
- This oil and gas instrumentation valve is commonly used in refineries, petrochemical plants, offshore platforms, pressure transmitter systems, and industrial process control applications.
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