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Advantages of a Welded Valve Configuration
- Totally self-draining
- Minimized deal legs
- Reduces surface contact and hold up volume of the medium
- Compact assembly
- Reduces number of welds
- Provides a ready-made assembly for field installation
Welded valve configurations are designed to improve the process in aseptic production facilities by reducing the dead legs in accordance to cGMP. Welded valve configurations may be as simple as a valve by tube fabrication or as complex as multiple valve bodies of different sizes welded into a valve cluster. All welded end connections are available.
The applications are endless and the challenge is to efficiently meet the process needs. Strict quality control is followed for every welded valve configuration produced by SED. All weld seams that are accessible are polished according to the interior surface specification.
The completed welded valve configuration is visually inspected and 100% are pressure tested. During installation of welded valve configurations it is important to follow good piping practice to guarantee the valve assemblies drainability.
D-Rule
The D-Rule is the dead leg as a relationship between the B and D dimension as described in ASME BPE. This definition is a helpful guideline to describe the maximum allowable dead leg of combined components which are installed into aseptic process systems or process skids. The dead leg is described with the B dimension in mm as absolute value or as a relationship of B/D.
Depending on the nominal diameters of the combinations and / or the positioning of the valve body, the relation can shift between 2:1 and 5:1. If the D-Rule is specified and the requirements can not be met with a welded valve configuration, the solution is manufacturing of the valve body as a multiport valve which is made from solid block material.
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