Page 2
7025 Instruction Manual (Rev. 2)
The piston almost touches the cylinder end at each stroke, regardless of the
pre-set volume. This ensures that all air taken into the pump is expelled with
each stroke.
Figure 1 “Linkage”
The stroke volume knob can be adjusted either while the pump is running or at
a standstill. Volume is clearly indicated
on a stationary scale
rather than on a
mobile slotted link or by graduation marks on the cylinder, either of which
leads to uncomfortable volume setting, the latter adjustable only when the
pump is in motion.
The mechanism does not incorporate the slotted link assembly found on other
ventilators. The reciprocating motion is generated, adjusted and transmitted to
the piston by pivoting joints and rods only.
This lack of sliding friction leads to:
A.
practically no wear
B.
no backlash, and hence silent operation
C.
exact stroke reproducibility
D.
minimal maintenance requirements
2.2 Cylinder/Piston
&
Valve
Four different cylinder/piston assemblies are available: 1, 5, 10 and 30 ml.
