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P1D

Cylinder

05.03

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Example 1 : Which tube diameter should be used?

A 50 mm bore cylinder is to be operated at 0.5 m/s. The tube
length between the valve and cylinder is 2 m. In the diagram we
follow the line from 50 mm bore to 0.5 m/s and get an “equivalent
throttling bore“ of approximately 4 mm. We continue out to the
right in the chart and intersect the line for a 2 m tube between
the curves for 4 mm (6/4 tube) and 6 mm(8/6 tube). This means
that a 6/4 tube throttles the velocity somewhat, while an 8/6 tube
is a little too large. We select the 8/6 tube to obtain full cylinder
velocity.

Example 2 : What cylinder velocity will be obtained?

A 80 mm bore cylinder will be used, connected by 8 m 12/10
tube to a P2L-B valve. What cylinder velocity will we get? We
refer to the diagram and follow the line from 8 mm tube length up
to the curve for 12/10 tube. From there, we go horizontally to the
curve for the Ø80 cylinder. We find that the velocity will be about
0.5 m/s.

Example 3 : What is the minimum inner diameter and
maximum lenght of tube?

For a application a 125 mm bore cylinder will be used. Maximum
velocity of piston rod is 0.5 m/s. The cylinder will be controlled by
a P2L-D valve. What diameter of tube can be used and what is
maximum lenght of tube.
We refer to the diagram. We start at the left side of the diagram
cylinder Ø125. We follow the line until the intersection with the
velocity line of 0.5 m/s. From here we draw a horizontal line in the
diagram. This line shows us we need an equivalent throttling
bore of approximately 10 mm. Following this line horizontally we
crosses a few intersections. These intersections shows us the
minimum inner diameter (rightside diagram) in combination with
the maximum length of tube (bottomside diagram).

For example:
Intersection one: When a tube (14/11) will be used,
the maximum length of tube is 0.7 meter.
Intersection two: When a tube (—/13) will be used,
the maximum length of tube is 3.7 meter.
Intersection three: When a tube (—/14) will be used,
the maximum length of tube is 6 meter.

Example 4 : Determining tube size and cylinder
velocity with a particular cylinder and valve?

For an application using a 40 mm bore cylinder with a valve with
Qn=800 Nl/min. The distance between the cylinder and valve
has been set to 5 m.

Tube dimension:

What tube bore should be selected to obtain

the maximum cylinder velocity? Start at pipe length 5 m, follow
the line up to the intersection with 800 Nl/min. Select the next
largest tube diameter, in this case Ø10/8 mm.

Cylinder velocity:

What maximum cylinder velocity will be

obtained? Follow the line for 800 Nl/min to the left until it
intersects with the line for the Ø40 mm cylinder. In this example,
the speed is just above 1.1 m/s.

Valve series with respective flows in Nl/minute

Valve series

Qn in Nl/Min

Valvetronic Solstar

Interface PS1

100

Valvetronic Interface 2000

100

B2 Series

168

Adex A05

173