ESD Seal liquid storage vessels

Function
A suitable liquid is required to lubricate the seal faces. Even though the consumption of this seal liquid may be extremely small at a sealing gap of < 1 µm in height, a certain amount needs to be kept available in order to ensure significantly long periods of no-maintenance. If this lubricant is kept in an enclosed space (seal chamber), then pressurization of this space to values that lie above the vessel pressure can avoid the product to be sealed from penetrating into the seal chamber and from escaping via the atmospheric seal side.

Differently designed seal liquid storage vessels, modifications to hydraulic installations, accessories and instruments as well as design variations of the seal chamber itself offer individual advantages with respect to operational safety, service life and automation.

Quality
ESD mechanical seals are designed on criteria ensuring minimum leakage rates involving usage of FEA. In contrast to other principles they therefore only require small reserves of lubricant. The result are both safe and low-cost solutions.

All ESD mechanical seals and accessories are suitable for applications in hazardous areas and are TÜV certified in accordance with ATEX standard 94/9/EC.

Application data VG
Area of application: all ESD shaft seals with exception of type ESD42 and ESD84
Volume: 1.5 liter
Working pressure: up to 10 bar
Cooling water flow rates for optional cooling water jacket:
Shaft diameter from 40 to 100 mm Qmin > 50 l/h
above 100 mm Qmin > 70 l/h

Application data VGS
Area of application: all ESD shaft seals with exception of type ESD42 and ESD84
Volume: 1.5 liter or 6 liter
Working pressure: up to 16 bar
Cooling water flow rates for optional cooling water jacket:
Shaft diameter from 40 to 100 mm Qmin > 50 l/h
above 100 mm Qmin > 70 l/h

Installation
The seal liquid storage vessel type VG can be applied with or without a pressure overlay. On both ends the storage vessel is fitted with sight glasses allowing the filling level to be monitored. Seal liquid circulation takes place by means of thermosiphon effect; if necessary additional cooling of the storage vessel by means of a cooling water jacket can be carried out.

The seal liquid storage vessel type VGS is based on the storage vessel type VG and can also be fitted with a cooling water jacket. This type is in addition fitted with a magnetic float switch allowing the liquid level to be monitored from a remote location.