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Product Information
Boutique Gas Spring Niche Set Up.
Izerwaren is focused on the special, hard to find gas spring applications, for which big companies have no time. Everything is geared to satisfy customer’s special needs, in small quantities. All standard gas springs offered in our program are low frequently gas springs. They should not be operated more then a few times per minute. Continuous operated gas springs, for instance damping devises, can be special ordered upon request.
316 Stainless Steel Quality (A4) Gas Springs
IZERWAREN Stocks mainly Stainless Steel Gas springs. Stainless Steel gas springs are fabricated using 316 stainless steel. The rod is made of hard chrome plated 316 stainless steel. Tests and experience over time have proven that the gas spring withstands a corrosive environment very well. Our standard gas spring is build and continuously tested according to Lloyds Standard Cert. LRQ 0953426. We stock most sizes 316 stainless steel gas springs
Carbon Steel Quality Gas Springs
The same high quality gas springs can be ordered made of carbon steel. The cylinder can be either black painted with a highly durable epoxy paint, or rubber coated. The rods are carbon steel hard chrome plated. We usually do not stock carbon steel gas springs, unless will-call orders are placed.
Construction of standard compression gas springs; as in picture above
IZERWAREN stainless steel gas springs have a cylinder filled with Nitrogen. This Non Combustible Nitrogen gas is pressurized in the cylinder (up to approximately 2000 PSI, depending on the series of gas springs (check our conversion tables for relations of Bar-PSI-Lb.-Kg-Newton). The gas spring is filled through an orifice in the threaded rod on the cylinder side. The pressure is maintained by means of a Schrader type valve. Releasing pressure is possible by pressing lightly on the pin in the Schrader valve. The pressurized gas exerts a force to the backside of the rod. This force is a function of the square surface of the rod and the pressure of the gas. The force is read in Newton’s. The piston on the end of the rod has a calibrated orifice. The size of the orifice determines the extension speed of the gas spring. Because of the orifice in the piston, gas flows on both side of the piston. The piston itself has no effect on the force on the rod. The compression speed is not dampened. The rubber seal around the piston will simply drop away inside an internal grove when the gas spring is compressed. The rod-seal is made of special nitrite material that hardly needs any lubrication. Nevertheless a little vegetable based industrial oil is added to the gas to lubricate the seals. It is therefore important to mount the gas spring with the cylinder up, and the rod down. This position also allows the outgoing stroke to be smoothly dampened towards the end of the stroke. For calculations, also check: “How to determine the right size gas spring”
Custom Calibrated Extension Speed
The extension speed can be changed by changing the size of the orifice in the piston. Please indicate when ordering if a special (mostly slow) extension speed is required.
Custom Calibrated Compression Speed
By adding a special seal, the compression speed can be controlled. This adds to the overall length of the gas spring. Please specify your request when ordering.
Continuous Operated Gas Springs
Continues operating gas springs, like gas shocks, are available upon special order. With this set up, the ingoing, the outgoing stroke, the speed and force can be completely custom determined. Stainless steel execution is available.
Maintenance
Like every stainless steel product, it needs to be maintained properly with the products that are available and especially made for this goal, i.e. stainless steel cleaning agents. The rod should be kept clear by wiping with a soft cloth and baby oil. Avoid foreign objects, paint, abrasive cleaners, etc. The cylinder only can be treated with stainless steel wax.
Adjustable Force due to valve
Gas springs are charged by Izerwaren Inc. Our gas springs are provided with a valve, so charging / bleeding of the gas spring is possible. We provide in our program a Bleeding Gage Set for controlled down bleeding and pressure checking. Check this section on this web site for purchasing a Bleeding Gage Set.
Gas spring force
The compressing force and the force of extension are indicated in N. (Newton; 1 kilogram or 2.2 pounds = 9.81 N) The Newton force of the gas springs in our program have a range from 50N up till 10,000N. (2.200 LB.) That means that a weight 2200 lb. can be balanced by a Force of 10,000 Newton. The thickness of the rod determines the force that a gas spring can exert. See “conversion tables for forces”. The force range per gas spring between compressed and extended is roughly 15%. IZERWAREN gas springs sizes are specifically designed to fit in tight spaces. The shortest possible set up is per series chosen. By lengthening the cylinder, but not the rod of any given gas spring, a flatter run up in force can be achieved. Special order only.
Safety
The nitrogen filling of the gas spring is incombustible. Because of the way the gas spring is constructed, explosion of the gas spring is not possible. The seal will fail first, if the pressure becomes too high, due to overheating. Gas springs operating under outside the temperature limits are void of warrantee. Izerwaren in not responsible for failures of gas springs due to operating under these circumstances. See our “liability chapter”
Temperature
Gas springs can be used in a temperature range of minus 30 degree Celsius up to 80 degrees Celsius. The force of extension increases/decreases by 3.4 % per 10 degrees Celsius. Nominal operating temperature: 20 degrees Celsius.
Warranty
IZERWAREN gas springs have a one year factory warrantee on parts for manufacturing defects only. See disclaimers.
Life term
The life term of a gas spring is almost unlimited, provided that the gas spring is correctly positioned (cylinder up, rod down) under axial load only and not being bent or receives lateral pressure by incorrect mounting. Also the piston rod should be kept clean and undamaged and free from scratches. To extend the life of the gas spring it is recommended to compress the gas spring a few times a month to lubricate the seals and piston rod
How to Choose the Right Gas Spring with the Right Charge
Please collect the following data: (or: let us do the calculating! Or Fax or e-mail your SCALED DRAWING)
A. The weight of the part (hatch) to be lifted.
B. The length of the hatch; this is the distance from the hinges to the lock (or locking) side.
C. The thickness of the hatch. Small hatches which are very thick -freezer hatches- need longer size gas spring.
D. The degree to which the hatch will be opened. 90 degrees or more, up to 100 degrees maximum)
To find the actual weight
Of an existing hatch, place a fish scale on the side of the hatch in a position as close as possible to the horizontal position and multiply the measured weight by 2. Keep in account the friction of the hinges, if any, and the weight of locking devises that can upset the center of gravity of the hatch. Adjust for these variables in the formula. Please find application samples on the following pages.
Determining the Stroke
As a rule of thumb the stroke of the gas spring is at least 1/4 of the total distance from the pivoting point to the locking side of the hatch. (See Diagram Application A)
 
Application A
#1: Distance from center hatch bracket to hinge pin.
#2: Distance from center coming bracket to hinge pin
#3: Total length of hatch, measuring always from hinge pin.
If hatch is 500 mm long, distance #1 is 125 mm. The stroke will be 150 mm, the series (in this picture the series 8-18 etc.) is determined by the force. In case of weak structures or Plexiglas place the gas spring further away from the hinge. Choose the next size bigger gas spring. This rule is based on the hatch opening of 90 degrees; gas spring mounted in the rim (application A). If a different opening of the hatch is desired, the stroke has to be recalculated accordingly. For more applications, see Catalog Pages 6-3 and 6-4.
Determining the Force
X = the total unhinged weight of the hatch in N = the force in N (Newton). Add to this a recommended 10-15% extra force to allow for a positive force to hold the hatch open in place. (1 kg = 2.2 pounds = 9, 81 Newton force)
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