Flowserve Machinery Components - Manual (Page 2)

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1. Drawing, Brief Description, Explosion Protection, Functional Requirements
This mechanical seal is designed to provide reliable performance under a wide range
of operating conditions. The information and specifications presented in this product
brochure are believed to be accurate, but are supplied for information purposes only
and should not be considered certified or as a guarantee of satisfactory results by
reliance thereon. Nothing contained herein is to be construed as a warranty or
guarantee, express or implied, with respect to the product.
Although Flowserve Corporation can provide general application guidelines,
it cannot provide specific information for all possible applications.
The purchaser/user must therefore assume the ultimate responsibility for the proper
selection, installation, operation and maintenance of Flowserve products. Because
Flowserve Corporation is continually improving and upgrading its product design,
the specifications, dimensions and information contained herein are subject to
change without notice.
1.1 Assembly Drawing
The assembly drawing is included in the shipping box with the mechanical seal.
1.2 Brief Description
A mechanical seal is a device designed to seal a rotating shaft against a stationary hou-
sing, e.g. a pump shaft against a pump casing. The stationary components will consist
of a seal ring and (depending on the design) a springloaded element. The spring-loaded
element can be a spring or a bellows. The seal ring is sealed against the housing with a
secondary gasket, e.g. an O-ring. The rotating components will consist of a seal ring and
(depending on the design) a spring-loaded element.
The spring-loaded element can be a spring or a bellows. The seal ring is sealed against
the shaft with a secondary gasket, e.g. an O-ring.
A mechanical seal can be supplied as a pre-assembled cartridge or in separate compon-
ents. Assembly is done in accordance with the assembly drawing. A mechanical seal will
run in the pumped product or external source fluid. Liquid seals must always have a film
of liquid present between the seal faces. Gas seals must always have a film of gas pre-
sent between the seal faces. The sealing surfaces are separated from each other by a
fluid film (liquid or gas) during shaft rotation and in principle run without contact and
thus minimal wear under these conditions.
1.3 Explosion Protection
The mechanical seal is regarded as a machine element. Machine elements do not need
to comply with Directive 94/9/EC (ATEX 95 product guide) as these are regarded as an
integral part of a larger piece of machinery (pump, agitator). This has been confirmed
by both the EC ATEX standing committee as well as the European Sealing Association
(ESA). Reference is made to following web-sites:
EC ATEX standing committee: http://ec.europa.eu/enterprise/atex/rotating.htm
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