Introduction
DESCRIPTION
This instruction book provides information for the proper
installation, operation, and maintenance of the Chemtube® 2000
Tubular Diaphragm Metering Pump. Chemtube 2000 is a
hydraulically actuated tubular diaphragm pump.
The Chemtube 2000 provides accurate metering and transfer of a
wide variety of chemicals and is available in three piston sizes (52,
68, and 88mm), four stroking speeds (36, 72, 96, and 144 strokes per
minute), and a simplex or a double simplex arrangement.
The liquid end uses two diaphragms. A flat disc diaphragm and
tubular diaphragm form a sealed intermediate chamber between
the process fluid (inside the tubular diaphragm) and the hydraulic
fluid (inside the piston displacement cylinder). The liquid surrounding
the tubular diaphragm is a water/propylene glycol mixture (50/50) and
is compatible with most process fluids. There are no mechanical
connections between the two diaphragms and the pump drive. Both
diaphragms are hydraulically balanced during pump operation. The
disc diaphragm is driven by hydraulic fluid, which is driven by the
pump piston. The piston causes the liquid in the intermediate
chamber to displace the tubular diaphragm and create pumping
action with each stroke of the piston.
The pump features built-in, adjustable pressure relief valve and
cartridge type valves for ease of service; an automatic hydraulic
fluid make-up valve that is mechanically actuated by sensing
the position of the flat intermediate diaphragm; a stroke adjuster
(manual or optional electric) that is capable ofvarying the stroke from
zero to 100%; and the electronic leak detection system that monitors
the conductivity of the intermediate fluid and will automatically
signal a change due to leakage through the tubular diaphragm of
the process fluid. Also, when the optional Teflon-lined tubular
diaphragm is used, the Chemtube 2000 pump is capable of handling
a variety of corrosive fluids.
When an electric stroke length positioner or variable speed drive is
used with the pump, a separate instruction manual covering
the particular equipment used will be furnished.
