vetus GASSP25 Stainless Steel Gas Strut Instruction Manual

: June 9, 2024
: vetus

Table of Contents

vetus GASSP25 Stainless Steel Gas Strut
Safety
Selecting the right gas strut
Example in Imperial units
Fitting advice
Maintenance
Technical details
Principal dimensions
References
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vetus GASSP25 Stainless Steel Gas Strut

vetus-GASSP25-Stainless-Steel-Gas-Strut-product

Safety

Danger
Never open a gas strut! The gas strut is filled with nitrogen gas at very high pressure. Nitrogen is non-combustible, cannot explode and is not poisonous.

Care
Take additional safety precautions as the malfunctioning of a gas strut could lead to serious or fatal injury.

Care
Keep hold of the hatch during opening or closing until the gas struts have reached their final position. Letting go of the hatch beforehand can result in injury to persons or damage to the feet or the rod heads of the gas struts.

Note

A gas strut should preferably be stored vertically with the piston rod pointing downwards.
When using for the first time or after not having been used for a longer period, more force may be required to get the gas strut moving than is stated in the technical specification.

Selecting the right gas strut

The following details are needed in order to be able to select the right gas strut

G = the total weight of the hatch N (Newton) (≈ the mass in kg x 10)
W = the width of the hatch

The following formula applies for the most usual arrangement as shown in the drawing: F x S = G x ½ W.

Calculate G x ½ W.
Select a gas strut with an F x S value that is about the same
select 2 gas struts with an F x S value that is about half as big. Always fit two gas struts that are the same size!

If a gas strut with a smaller F x S value is selected, the hatch will never open by itself. If a gas strut with a larger F x S value is selected, the hatch will open by itself and must be secured to prevent unintentional opening

For example:
A hatch has a weight G of 110 N (the mass is 11 kg). The width W of the hatch is 600 mm = 0.6 m. F x S = G x ½ W = 110 x ½ x 0.6 = 33 Nm

If 1 gas strut type GASSP44 (F x S = 28.8 Nm) is selected, it will always be necessary to apply some force to open the hatch.
Alternatively, if 2 gas struts type GASSP38 (F x S total = 2 x 18.9 = 37.8 Nm) are selected, a slight force will be needed to hold back the hatch to prevent it from opening unintentionally.

Example in Imperial units

A hatch has a weight G of 25 lbf (the mass is 25 lb). The width W of the hatch is 24 inches = 2 ft. F x S = G x ½ W = 25 x ½ x 2 = 25 ft.lbf

If 1 gas strut type GASSP44 (F x S = 21.2 ft.lbf) is selected, it will always be necessary to apply some force to open the hatch.
Alternatively, if 2 gas struts type GASSP38 (F x S total = 2 x 13.9 = 27.8 ft.lbf) are selected, a slight force will be needed to hold back the hatch to prevent it from opening unintentionally

Fitting advice

Preferably fit the gas strut in a dry, dust-free space. A corrosive atmosphere shortens the lifetime.
Fit the gas strut so that the piston rod points downwards. There is a small amount of oil in the gas strut. This oil lubricates the piston, the piston rod and the piston rod seal and also acts as a damper at the end of the stroke.
The gas strut may never be fitted too tightly. The rod heads must be free to turn in order to prevent any flexural strain on the cylinder or the piston rod. The gas strut may only be stressed axially.
Use suitable, self-locking fixing materials to fit the two feet supplied. The fixing materials must be capable of absorbing the resulting forces!
Prevent welding and paint splashes on the gas strut and damage occurring to the piston rod while fitting. Damage can ruin the seal resulting in leaks.

Maintenance

Grease the rod heads lightly.
Clean the piston rod regularly with a clean cloth or kitchen paper.

Do not use oil, grease or water!

Technical details

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Type

| Force F in N (lbf)| Stroke S in mm (inches)| F x S in Nm (ft.lbf)| Length L in mm (inches)| Length L+S in mm (inches)
---|---|---|---|---|---
GASSP25| 180)| 74| 13.3| 180| 254
| (40.5)| (2 29 / 32 ”)| (9.8)| (7 3 / 32 ”)| (10”)
GASSP30| 135)| 85| 11.5| 220| 305
| (30.3)| (3 11 / 32 ”)| (8.5)| (8 21 / 32 ”)| (12”)
GASSP38| 135)| 140| 18.9| 240| 380
| (30.3)| (5 1 / 2 ”)| (13.9)| (9 1 / 2 ”)| (15”)
GASSP44| 180)| 160| 28.8| 280| 440
| (40.5)| (6 5 / 16 ”)| (21.2)| (11”)| (17 5 / 16 ”)
GASSP51| 270*)| 205| 55.3| 305| 510
| (60.7)| (8 1 / 16 ”)| (70.8)| (12”)| (20 1 / 16 ”)