What is a monoflange double block and bleed valve- Why to use it?

The Monoflange DBB is a specific design that removes the requirement of multivalve systems. Moreover, the installation of transmitter or gauge equipment is also made highly compact thanks to the monoflange valves. Basically, the working of monoflange valve is to replace another equipment. For suppose, if you can use just one valve and the isolation of transmitter depends on that single valve, you don’t need to use two valves. So, in such case, a double block and bleed monoflange will serve the purpose.

Monoflange valve working and advantage

The monoflange double block and bleed valve will remove the requirement of two separate valves and the complexity of the system will be reduced because now, just one monoflange valve will be able to serve the purpose. There are two valves in a monoflange which are closed and then opens a vent so that the pressure in between the valves can be reduced. There are various benefits of using a monoflange double block and bleed valve which include reduction in weight and leak paths. Hence, the valve provides you with a higher integrity system. Moreover, in case there is any damage caused by the vibration, the damage can also be reduced because of the reduction in the length of installation- thanks to monoflange valve.

The operation of monoflange valve

The monoflange double block and bleed valves are able to be mounted directly on the horizontal or vertical flanged connections. This type of assembly allows the gauge to be in an upright position. The monoflange valve thus becomes suitable for both the instrument and the primary isolation providing instrument mounting, venting and isolation, all in just one compact unit. This design of the monoflange valve comprises of safety features which reduce the vibrations and hence, the gauge installation’s overall height is also decreased.

Need to purchase high quality monoflange valve

If you want to make sure the integrity of the system, you should keep this fact in mind that the monoflange double block and bleed valves can be affected by the conditions in which the process is carried, e.g. temperature and pressure. Therefore, you must buy high quality units. There are a variety of configurations from which you can select the most suitable monoflange valve. It can be a single valve, two- valve or three valve configuration. There are a variety of sizes too along with various fittings.

Materials used in monoflange valves

Generally, the materials used in the manufacturing of monoflange double block and bleed valves are copper, molybdenum, chromium, manganese, carbon, nickel and silicon. The alloy can be made suitable by using different proportions of these materials so that the end product is able to exhibit required mechanical properties, like the tensile strength, break point, or other properties that determine the quality and health of materialso that the material can sustain the conditions in which it will be kept. For example, if the environment is changeable, wet, humid, dry, hot or corrosive.

Maintenance issue with the monoflange valve

When the installation of monoflange valve is done on a non- blocking and clean process, then it is very rare that the access to tapping point may be required. In such case, closed coupling is done in order to remove the need of instrument fittings and hence the potential leak failure points can be eliminated. You should always purchase high quality monoflange valves and take care of all the precautions for ensuring proper functioning of instrument assembly.

Applications of monoflange double block and bleed valve

The monoflange double block and bleed valve, as already mentioned removes the requirement of multiple valves and due to this amazing benefit of monoflange valves, the potential leak paths get reduced to a great extent. Moreover, the overall system mass is also reduced which ultimately decreases the stresses due to vibration and loading. The monoflange double block and bleed valve will further enhance the reliability and safety in this way.
Many operators prefer to use monoflange valves owing to its smaller size than the traditional double block and bleed valve. They believe that the monoflange valve provides them with amazing advantages in terms of weight and space. They find applications in various processes such as the chemical injection, light liquid or gaseous service and the process to instrument interface.

The market applications of monoflange valves are found in the following industries:

  • Chemical
  • Petrochemical
  • Oil and Gas onshore
  • Offshore oil and gas

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