Monoflanges
In the modern industrial landscape, the drive toward “lean” engineering has revolutionized instrumentation. Kriloha Gaskets, a premier authority in sealing technology and fluid control, is proud to feature our advanced range of Monoflange Valves. Positioned within our Valve and Fitting Accessories category, monoflanges represent the ultimate evolution in primary isolation, replacing traditional bulky multi-valve bock-and-bleed assemblies with a single, sleek, flange-mounted unit.
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What is a Monoflange Valve?
A Monoflange is a highly engineered valve manifold designed to mount directly onto a process equipment flange. Unlike traditional “Big Block” valves, the Monoflange incorporates one, two, or three valve needles (for block, bleed, and/or vent functions) within a body that is no thicker than a standard pipe flange.
The Evolution of the “Single Block”
Traditional instrumentation setups required a primary isolation valve, followed by several nipples and a separate bleed valve. Each connection point was a potential leak path. The Kriloha Monoflange eliminates these connections, providing a direct, forged interface between the process piping and the instrument.
Technical Specifications and Material Integrity
At Kriloha Gaskets, we understand that Monoflanges are often the first line of defense in high-pressure systems. Our valves are manufactured using the highest quality forgings to ensure structural grain flow and maximum pressure containment.
Material Selection:
Stainless Steel 316/316L: Our standard for general corrosion resistance and durability.
Duplex (F51) & Super Duplex (F53/F55): Specifically engineered for chloride-rich environments and high-stress offshore applications.
Hastelloy C276: For extreme resistance to aggressive chemicals and acids.
Inconel 625: Ideal for high-temperature service where oxidation resistance is critical.
Design Standards:
Flange Ratings: Compliant with ASME B16.5 (Class 150 to 2500) and API 6A.
Face-to-Face Dimensions: Designed to minimize space while adhering to international piping standards.
Fire Safe Design: Many models are available with fire-safe certification (API 607/ISO 10497) for use in volatile environments.
Configurations: Single, Block & Bleed, and Double Block & Bleed
To meet the specific safety protocols of your facility, Kriloha Gaskets offers three primary Monoflange configurations:
Single Block Monoflange: Features one isolation valve. Ideal for simple isolation where venting is handled downstream.
Block and Bleed (B&B): Features one isolation valve and one vent valve. This allows for instrument isolation and the bleeding of trapped pressure before maintenance.
Double Block and Bleed (DBB): The pinnacle of safety. It features two isolation valves and one vent valve in a single block. This creates a redundant barrier, ensuring that even if one seal fails, the process remains contained while the instrument is serviced.
Available Profile Configurations
Critical Advantages of Kriloha Monoflanges
Why are engineers switching from traditional valve trees to Kriloha Monoflanges?
1. Massive Weight Reduction
In offshore or skid-mounted applications, every kilogram counts. A Monoflange can reduce the weight of an instrumentation hookup by up to 70% compared to traditional gate valve setups.
2. Fugitive Emission Control
With fewer threaded or flanged connections, the risk of “fugitive emissions”—unintended gas leaks—is dramatically reduced. This makes Monoflanges the environmentally responsible choice for modern ESG-compliant facilities.
3. Vibration Resistance
In high-vibration environments, long “cantilevered” valve assemblies are prone to fatigue failure. The compact, low-profile design of a Monoflange brings the center of gravity closer to the pipe, virtually eliminating vibration-related stress.
Installation and Safety Best Practices
Gasket Selection: As Kriloha Gaskets, we recommend pairing our Monoflanges with our high-quality Spiral Wound Gaskets or Ring Type Joints (RTJ) to ensure a perfect seal at the flange interface.
Torque Sequence: Always use a calibrated torque wrench and follow the “star pattern” when bolting the Monoflange to the process flange to avoid uneven loading.
Orientation: Ensure the vent port is oriented such that any discharged media can be safely piped away or captured, especially in gas service.
Frequently Asked Questions (FAQ's)
Q: What is the main benefit of a Monoflange over a standard Double Block and Bleed valve?
A: The primary benefits are space and weight. A Monoflange is significantly thinner and lighter, making it easier to install in tight spaces and reducing the structural load on smaller process pipes.
Q: Can I mount a pressure gauge directly to a Kriloha Monoflange?
A: Yes. Our Monoflanges typically feature a 1/2″ NPT female outlet, allowing for the direct mounting of gauges, transmitters, or even a second needle valve for secondary control.
Q: Are these valves suitable for vacuum service?
A:Absolutely. Our precision-machined metal-to-metal seats and high-quality stem packing (PTFE or Graphite) ensure excellent sealing performance in both high-pressure and vacuum conditions.
Q: Do you provide Monoflanges for Sour Gas (H2S) service?
A: Yes, we offer NACE MR0175 / ISO 15156 compliant versions. We use specifically heat-treated materials and hardness-controlled forgings to resist sulfide stress cracking.
Q: What is the lead time for specialty materials like Inconel or Duplex?
A:While we stock standard Stainless Steel units, specialty alloys are made to order. Our streamlined manufacturing process for Kriloha Gaskets accessories typically ensures a lead time of 4–6 weeks for exotic materials.
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