EQ UIPMENT NEWS

ECO-Seal ~ systems from Graham Precision Pumps use lubricants as a seal fluid.

B Liquid ring vacuum pump needs no coo l ing water

Graham Precis ion Pumps has in t roduced ECO-Seal ®, a new des ign of t o t a l r e c i r c u l a t i o n sys tem which uses lub r i can t s r a t h e r t h a n w a t e r as a seal fluid. This e l imina tes the need for a cons t an t supp ly of wa te r ( supp l i ed a t 15°C ideal ly) to pul l and m a i n t a i n the des i red level of vacuum d e m a n d e d by a c o n v e n t i o n a l l i q u i d r i n g p u m p ins ta l la t ion . Even if a full recovery sys tem is used, w a t e r sea led p u m p s requi re wa te r to make up for evapora t ion and a lso as a cool ing sou rce to ma in t a in the l iquid t e m p e r a - ture in the circuit. ECO-Seal systems use a m b i e n t a i r as the cooling source.

The sys tems are supp l i ed as se l f -conta ined un i t s p re-wired and ready for opera t ion .

They i n c r e a s e c a p a c i t y a t high vacuum due to the low v a p o u r p re s su re charac te r i s t i c s of the lubr ican t seal fluid, redu- cing the power requi rements .

The sy s t em has on ly one

moving par t , the impe l l e r shaft assembly, and requ i res mini - m u m m a i n t e n a n c e . The sea l fluid requi res r ep l acemen t af ter a p p r o x i m a t e l y 10 000 hours of con t inuous or i n t e rmi t t en t op- e ra t ion in mos t cases. ECO-Seal systems have low noise levels and min ima l v ib ra t ion measure - men t s giving a comfor tab le en- v i ronment for working.

Most of the seal fluids provide corrosion protec t ion of the inter- na l p a r t s a n d p r e v e n t sca le forming. Any solids carr ied over to the vacuum system are fil tered out to s top erosion of the unit.

Contact: Graham Precision Pumps Limited, The Forge, Congleton, Cheshire CW12 4HQ, UK. Tel: + 4 4 260 274721; Fax: + 44 260 276965.

Vertical p u m p s made sea l less and bearing free

Sethco has in t roduced a new line of ver t ica l pumps .

The ZSX series p u m p s are cons t ruc ted of cor ros ion resis- t a n t s t a in l e s s s tee l 316 and

ZSX series vertical pumps' opposing twin-impeller design eliminates leakage up the pump column.

are r e c o m m e n d e d for t ransfer - ring, rec i rcula t ing and ag i ta t ing a wide range of chemical , lab- o ra to ry and indus t r i a l p rocess appl ica t ions .

Typica l u se s for t h e new s ta in less steel p u m p s are sol- vents, a lka l ine solut ions, some acid solut ions, e lec t ro less nickel p la t ing, a lka l ine c leaning tank, pho to res is t solut ions, p h a r m a - ceuticals , cosmetics , agr icul tur - al chemicals , nickel ace ta te seal so lu t ions to 210°F and hydrau- lic fluids.

The s t a in less s tee l mode l s i nco rpo ra t e a un ique oppos ing twin- impel le r design. This de- sign fea ture provides high vo- lume c i rcula t ion and e l imina tes leakage up the p u m p column. The absence of bear ings or seals pe rmi t s d ry running.

The p u m p s are eng ineered to provide flows up to 100 gpm and heads up to 20 m.

Other fea tures inc lude self p r iming s ta r t -up , and c o mpac t const ruct ion.

Contact: Sethco, a division of Met-Pro Corporation, 70 Arkay Drive, Hauppauge, New York 11788-3773, USA. Tel: +1 516 435 0530; Fax: +1 516 435 0654.

• Advanced high temperature diaphragm for food pump

A food g r a d e f l u o r o s i l i c o n e / FFFE bonded d i a p h r a g m devel- oped by RE Compone n t s has enabled 1Tr Jabsco to des ign a p u m p capab le of ope ra t ing a t t e m p e r a t u r e s up to 200°C in flash frying equipment .

The p u m p is based on the company ' s ex is t ing Pureflo 24 series of posi t ive d i sp l acemen t ro t a ry p u m p s a n d h a s been des igned to c i rcula te flash fry- ing oils t h rough a f i l ter to purify t h e m for re-use. RE Compo- nent ' s d i a p h r a g m forms pa r t of a p ressu re re l ief valve which fits d i rec t ly on to the p u m p in p lace of the end cover wi th the face mee t ing the oils.

The p r e s s u r e r e l i e f va lve h e l p s to p r o t e c t t h e p u m p a g a i n s t excess ive p e a k p res - sures and aga ins t b locked pipes ,

WORLD PUMPS JANUARY 1997 (