ESD66H / Pressure Splitting Device

Function

• In conventional double acting mechanical seals 2 pairs of seal rings form one seal chamber (1) for the buffer fluid.
• In a triple acting mechanical seal an additional pair of seal rings forms an additional seal chamber.
• The pressure compensator VD120 increases the vessel pressure P0 (green) slightly up to the pressure P1 (blue) of the seal chamber (1).
• The pressure splitting device VD120PS reduces the pressure P1 (blue) of the first seal chamber (1) to the halt P2 (red).
• As a result the intermediate pair of seal rings between chambers (1) and (2) and the outboard pair of seal rings are exposed only to half of the pressure drop than in a conventional double acting mechanical seal.

 
Application
-        highly toxic or explosive products (i.e. hydrogen)
-        hazardous processes
-        processes demanding high reliability in operation
 
Advantages

• Highly extended live time compared to double acting mechanical seals.
• No shutdown required in emergency situations: the seal can be operated as a double acting mechanical seal, if one pair of seal rings fails.
• Automatic detection and localisation of leaks.

 
Application Limits
Vessel pressure: Vacuum ... 200 bar
Vessel temperature: -50 ... +400° C
Shaft diameter: 40 ... 220 mm
Seal face velocity: 0 ... 3 m/s

Materials
Housing: Stainless steel
Product-wetted parts: Stainless steel, Hastelloy, Titanium, special materials
Seal rings: Carbon, Silicon Carbide
O-rings: Viton, EPDM, Perfluor elastomers, special materials
FDA approval: for all product-wetted parts