7
4
Ball valve positions
N o n - r e t u r n v a l ve i n
o pe r a t i n g pos i t i on, fl ui d fl ow
i n fl ow di re c t i o n o nl y
Ball valve open, fluid flow in
both di re ct i ons pos s i bl e
B al l val ve cl ose d, no fl ui d fl ow
5
Draining the system
O p e n
t h e b a l l v a l v e ( 1 0 ) .
O p e n
t h e a i r v e n t a t t h e h i g h e s t p o i n t o f
t h e s ys t e m ( a bo ve t he c ol l e ct o rs ) .
O p e n
t h e d r a i n v a l v e .
6
Non-return valves
T he n on - re t u r n v al ve s o f t he p um p s t a t i on a re
i nt e gr at e d i nt o t he bal l v al ve s i n fl o w a nd re t ur n
and have an ope ni ng pre s s ure of 0. 3 ps i / 20 mbar.
I n o r d e r t o c o m p l e t e l y d r a i n t h e s y s t e m , t h e
n o n - re t u r n v al ve s ha ve t o be ope ne d.
F o r
t h i s p u r p o s e , t u r n t h e h a n d l e s o f t h e
b a l l valves by 45
°
.
F or
nor mal s ys t e m ope r at i on, o pe n t he ba l l v al ve
com pl e t e l y.
Summary of Contents for FlowSol B
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