NEWS

move relative to each other, a very

small amount of PTFE is

transferred to the surface of the

shafi, which fills in microscopic

surface irregularities and establishes

an ideal running surface. This

results in an efficient and durable

sealing performance.

The seal design allows controlled

lip forces, which withstand high

pressures and shaft speeds, as well as

dry running capabilities. In fact this

type of seal can be run at speeds of

up to 17 500 rpm or 70 m/s.

Contact: Blue Diamond, 1 Bishopstoke Road, Eastleigh, Hampshire, S050 6AD, UK. Tel: +44 1703 629944; Fax: +44 1703 629771.

k m

Split seal for agitators and mixers The Fluid Sealing division of Flowserve has extended its PSS

range of mechanical seals with the introduction of PSS-A Dura seal, which is specifically des- igned for agitators and mixers.

The PSS range encompasses a

split seal design that guarantees ease

of fitting and assembly on

horizontal, vertical and double-

ended pumps and other rotating

equipment. However, the new PSS-

A is very versatile as it combines the

proven reliability of the PSS design

with the ability to handle increased

shaft run-out of up to 1.55 mm

FIM

It comprises the main

components of the standard PSS

seal. but has a redesigned rotor,

which can be manufactured from

either peranfic or silicon carbide.

The operating parameters of

PSS-A seal include temperatures up

to 121°C, pressures o f - bar and

speeds of up ro 1800 rpm for shaft

diameters up to 100 mm

[n addition, Flowserve has

introduced a cost-saving repair kit

tbr the full range of PSS products.

The kits can be supplied either

directly to users who have the

technical knowledge to undertake

their own repairs or Flowserve

engineers can carrv out repairs on

sire or back at the manufacturer.

Contact: Flowserve Corporation, Fluid Sealing Division, Dakota Avenue, Salford, Manchester, M5 2PU, UK. Tel: +44 161 869 1200; Fax: +44 161 869 1235.

Super hygienic pump seal Jabsco, a business group of ITT industries, has developed

a new single-face mechanical shaft seal for its Hy-line super hygienic rotor lobe pump, which provides product safety and high temperature capabilities.

The move from a flushed

seal to a single seal not only

eliminates the costs of flushing

water, but also the danger of the

waterleaking into the pump

resulting in serious product

contamination.

The single face seal design

ensures that the faces are

continually under a controlled

contact pressure, which provides

excellent sealing at both low and

high pressures.

Once installed, the seal is located

in the flow path of the fluid, with

the sealing faces fully exposed to the

liquid. This design guarantees

good circulation of the product,

preventing the formation of

stagnant areas where bacteria can

grow. It also has the addition

benefit of using the product flow to

keep the seal faces cool during

operation.

Hy-line single seals are available

in three face-material combin-

ations: carbon/stainless steel,

carbon/silicon carbide and silicon

carbide/silicon carbide, and can

operate in fluid temperatures as

high as 140°C.

Contact: Jabsco, Bingley Road, Hoddesdon, Herts, EN11 OBU, UK. Tel: +44 1992 450145; Fax: +44 1992 467132.

Cartridge seal reaches milestone John Crane Group is pleased to announce that since its launch nearly two years ago, the 5600

series universal cartridge seal has achieved more than 50 million hours of operating experience.

The 5600 series, which has five

basic seal configurations, was

originally designed for high

reliability and low maintenance. It

is able to operate in temperatures

up to 204°C, at pressures as high as

21 bar and at speeds up to 25.5 m/s.

In addition to high reliability

and low maintenance its design

allows easy installation, reduces the

likelihood of incorrect seal use and

provides cost-savings. In addition,

its interchangeable parts enables it

to he customised for a number of

different applications.

It represented the first global

cartridge seal family which met the

requirements of both ANSI and DIN

pump applications, as well as several

local or regional pump standards.

For more information, see the

dynamic sealing news article "Uni-

versal cartridge brings flexibility to

users" in Sealing Technology, April

1997.

Contact: John Crane, 6400 Oakton Street, Morton Grove, IL 60053, USA. Tel: +1 847 9672982; Fax:+1 847 9673915.

Sealing Technology No. 63 ( ~