How Monoflange valve works


Monoflange valves are used as an alternative to a system which has multiple valves. They are designed specially to provide a compact installation for transmitter and gauge instruments. In an application where a monoflange is used, it is used toreplace other equipment. For instance, rather than having one valve and relying on it to close so that you can isolate the transmitter, two different valves can be used.
In such case, a monoflange valve would replace two different valves perfectly. With this, you won’t need to have two different valves but a single one. This is because the monoflange is composed of two different closed valves as well as a vent which is opened so as to limit the pressure which is between them. It also has a reduced weight as well as minimal leak paths thereby providing a higher integrity system. The reduced length of the installation likewise reduces the risk of damage through vibration. You can either place the monoflange valve horizontally or vertically so as to ensure the gauge is standing upright. This is perfect for primary isolation i.e. double block and bleed, as well as instrument duties. A monoflange also make provision for isolation, instrument mounting and venting in a single unit. The design likewise has a safety features which helps to limit vibration and also reduce the entire height of the gauge which is installed.
So as to ensure the integrity of the system, it is essential to focus on the Monoflanges as well as Instrument Manifolds which are subject to process conditions e.g. temperature and pressure, it is therefore crucial to purchase a high quality units.

What materials are used and why?

The material which is generally used in the production of a suitable alloy are Silicon, Carbon, Chromium, Manganese, Molybdenum, Nickel and Copper in different proportions so as to create a different mechanical properties like tensile strength depending on the condition which they are to be placed. This implies that whether the environment is hot, corrosive, wet etc. it will be perfect for use and last for a long period of time.


So as to have a connection to a process which makes use of connection flanges, an optimal as well as compact measuring point will be enabled by the monoflange. Additionally, installation and potential leak points, stress from vibration and maintenance cost would bereduced very well. The monoflange can be mounted directly on the axial flanges thereby allowing the gauge to be kept in an upright position. The monoflange include a vent hole, block valve as well as a bleed valve.
A perfect working monoflange valve will provide a suitable condition of temperature as well as pressure and there are various types of valves which are perfect for the usage of monoflange valves, they include:

1. Isolation Block And Bleed

This type of valve is referred to as block and bleed valve and it has two different valves, however when there is many valves in a single block and bleed manifold, it can then be referred to as an isolation monoflange. This type of valve is mainly used in the flammable smoke trains in many industries. Immediately there is a little movement in an environment, immediately the needle valve allows a detailed streaming guidelines, the block and bleed valve can then be used in air-filled and fluidic systems.

2. Double Block And Bleed Valves

This method has replaced the conventional method which is used by pipeline engineers to generate double block and bleed configuration in channels where it is needed. This comprises of two block and one bleed valve which makes the process of installation easy for successful isolation. These kinds of valves are for systems with dangerous liquid progressions. Application which makes use of double block and bleed valves contains chemical cover separation, biochemical injection connection, tool drain as well as valve isolation. There are three different valves present in the system; two of the valves are isolation valves which perform the function of isolation while the remaining one is the drain valves.

3. Standard Length Double Block And Bleed Valves

This is a tested design which has three valves and one of valves is bleed valve while the other two are small ball valves. These three valves are included in the compact container unit which has the shape of a cartridge with ANSI B 16.5 flanged connections.
There are several benefits which can be derived from using the single ball valve because it has a similar frontal proportion hence they can be used to replace the existing pipeline valve without making any change to the pipeline.

4. Three Piece Non-Standard Length Dbb

Three pieces of non-standard double block and bleed is the traditional flange by flange valve and it include flanges, hub connections as well as welded ends. Thus, they are essential in a system where you need to install three-piece of nonstandard length of DBB. There is also a benefit because it is in the form of single-unit Double block and bleeds valves which has a dimension which you can make use of whenever the need arises.

5. Single Unit Double Block And Bleed Valves

This system includes operative benefits and few chances of pipeline leakage. The valves which are in this system does not have a significant pressure drop along the unit because of the flow opening which is not disturbed.


The monoflange valve has several applications and is perfect for use in different industries such as oil and gas, refineries and so on. Some of its applications include:

  • The monoflange can be used for measuring gases, liquids as well as vapors.
  • It can be used for corrosive pressure media as well as in aggressive environments
  • It can be used for industrial process plant within general plant construction, machine building, chemical or petrochemical, mining, power station, on and offshore as well as environmental technology.

The valve can also be utilized for attaching of pressure instrumentation wherever there is an integral flange. In addition to that, they can be placed between equipment in order to satisfy various design requirements of the system. The single type of integral design is used instead of a flange adapters and the presence of separate valves will help to reduce the number of paths where potential leaks can occur thereby creating a compact system.
The other advantage which can be achieved is in the significant weight as well as cost of component when it is compared with other kinds of installation. Monoflanges can be configured either as a single block and bleed or double block and bleed with the presence of plugged vent port for the bleed. The double block and bleed is also available in various types and is mostly used in the primary isolation position. Monoflanges are used in the installation process according with the ANSI/ASME standards, and the valve sat is entirely made of metal sealing, bonnet to manifolds as well as metal to metal interface seal.

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