How a piston globe valve can help your industrial process
In an industrial process, valves are used to control flow and pressure in pipelines carrying liquids, gases, vapors, etc.
For this purpose, we will address here the usage of conventional globe valve models and also piston valves.
Conventional Globe Valve
Widely used in industrial processes to control fluid flow and pressure regulation, this type of valve is characterized by its globe-shaped body.
Conventional globe valves use compression packings as sealing. This type of sealing material offers reliability and is recommended for a wide range of industrial applications.
However, the use of compression packings on globe valves, cause recurrent leaks and some replacement is necessary. However, his compression packings change is hampered by access to it and also by the need to depressurize the entire line, since this maintenance must be done without any pressure in the valve.
This type of valve also uses a gasket between the body and the bonnet. This type of seal may leak and, sometimes, results in erosion of the sealing surfaces, requiring replacement of damaged parts.
Bearing in mind that globe valves also use a kind of metallic internal sealing / metal, it is possible for leaks to appear, considering, that this type of sealing falls in class IV, dripping is allowed. In addition, considering that this type of seal does not have perfect contact, dirt may accumulate on the sealing surface and erosion of these surfaces may occur.
It is important to note that, any loss of steam must be analyzed and corrected, because it means wasted time, operation and also money.
Steam loss through leakage to the atmosphere (kg per hour)
Source: Utility Leak Prevention
*STEAM JETS ARE MEASURED ONLY IN LENGTH
Considering the table above, which relates the size of the leak jet with the maximum steam flow, if we take as an example a line pressure 9,3 20 bar, and a steam leak jet of 90 cm - the vapor loss will be 26,8 approximately kg / h.
Also considering the operating time: 24/7; 30 days / month the total steam lost per month will be 19,3 tons.
Assuming a cost of R $ 60,00 per ton - the total lost will be R $ 1.157,76 a month.
The red flag in case of the conventional globe valve is that, all these setbacks presented would result in high maintenance cost, waste of inputs and unwanted production stops, considerably harming the cost x benefit of using these valves.
Piston Globe Valves
Piston Globe Valves, on the other hand, have a cost-benefit ratio that makes the investment feasible.
The sealing system of the piston valves, is by graphite rings that don’t touch the piston
. This seal type, class VI, assures tightness for both the line and the atmosphere.
KLINGER exclusive sealing system of piston valves ensures Class VI sealing according to ANSI / FCI70-21, Standards, referring to the passage of fluid to the line.
The efficiency of these graphite rings is done through the insertion of expanded stainless steel sheets and by special physical properties of the graphite, allowing its usage at temperatures from -40ºC to 400ºC, suitable for thermal shocks and change of steam / condensate.
This seal is based on the contact between the piston (plug) and the sealing rings inner surface, with the contact with the lower ring (seat) blocking the flow to the piping and the contact with the upper ring making the seal for atmosphere. Precisely this contact between the piston and the upper ring replaces the gaskets and bonnet compression packings, which are used in conventional valves.
The piston valves have a low cost maintenance, as it is usually, necessary to replace only the sealing rings, items that cost approximately 5% of the cost of the valve. Maintenance is also easier, since the valve can be repaired by keeping the body installed in the pipeline.
Considering the piston valves characteristics, it can be said that this type of valve offers greater reliability against accidents caused by leaks.
In addition, energy savings and other inputs inherent to the process result in an irrefutable cost-benefit.
In addition to steam and condensate collection systems, KLINGER piston valves have proven effectiveness in applications such as thermal fluids up to 350°C, chemical fluids (stainless steel version) and gases.
This type of valve, is also available with special trim for fine adjustment. However, this feature is unique to the KLINGER piston valve.
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