GAS SPRINGS
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QUIRI HYDROMECANIQUEWHO ARE WE ? QUIRI Hydromecanique is specialized in designing and manufacturing of components and mechanical installations that use high-pressure fluids for process plant applications. We apply our know-how and experience to small-and medium-scale manufacturing of products with high technical added-value, and to installations specifically adapted to our client’s needs. To provide our clients with complete solutions. QUIRI Hydromecanique retains control over all the specialist skills involved in hydraulic engineering (electronic and mechanical engineering, computer...

TABLE OF CONTENT USEFUL INFORMATIONS 002 GAS SPRING & PRESSURE EQUIPMENT DIRECTIVE 2014/68/EU 012 HIGH POWER GAS SPRINGS 019 to 150mm 027 SUPER COMPACT GAS SPRINGS 025 to 150mm 071 CONNECTION MANIFOLD BLOCKS 118 COMPACT CONTROL BLOCKS 126 VISUAL PRESSURE CHECKER 127 MINI FLEXIBLE HOSES 130 INFLATING & PRESSURE OF GAS SPRINGS 133 DIE LIFTING / SPLITTING EQUIPMENT 142

USEFUL INFORMATIONCommercial Network m Q. O CO \ ro a ro a

USEFUL INFORMATION Gas Springs range selection www.quiri.com Micro

USEFUL INFORMATIONGeneral recommandations Ed:09 / 2020 ►► Gas springs are filled with high pressure Nitrogen and should not be repaired by non trained people. Never try to open a gas spring if you haven't received a specific training. ►► Never grind or weld near a gas spring. ►► Never modify nor machine a gas spring. ►► Never strike two gas springs rods against each other [the slightest mark on the piston rod may lead to a loss of pressure in the spring). ►► Never fill gas springs with a pressure higher than indicated on the body. ►► Never use a gas spring for other function than according...

USEFUL INFORMATION Technical data STRUCTURE OF QUIRI ISO GAS SPRING Stop ring O. ring Oil Lower lip seal Seal Guide ring O. ring Body Retention tube Oil Inflating valve Plug

USEFUL INFORMATIONTechnical data m Q. O CO \ ro a ro a GAS SPRING FORCE CALCULATION The force of a Gas spring depends on the Nitrogen pressure and the working surface. F kgf= P bar x S cm2, with S=(n.d2/4), n=3.14 Piston sealed gas spring ► RG 1500 ISO d = 36 mm = 3.6 cm P = inflating pressure = 150 bar S = n /4 x 3.62 = 10.17 cm2 F1 = 150 x 10.17 = 1525 kgf Unit conversion : 10 bar = 1 MPa 1 kgf = 9.81 N 1 daN = 10 N = 1.02 kgf Bore sealed gas spring : Super compact To calculate the working surface we must take the bore diameter - see the position of the seals.

USEFUL INFORMATION Technical data PRESSURE / FORCE BUILD-UP K As the piston rod enters the cylinder body, the inner gas volume will be reduced. Nitrogen, like all gas is compressible, therefore the pressure inside the body will increase. NB : In this calculation we do not consider temperature change. BOYLE-MARIOTTE law P1 x V1 = P2 x V2 => P2 / P1 = V1 / V2, P2 / P1 = K is called the pressure build-up. Pressure build-up K : Build-up coefficient (F2=KxF1) F1 = P1 x S and F2 = P2 x S => F2 = (P2 / P1) x F1 = (V1 / V2) x F1 = K x F1 V2 is the initial volume minus the volume of the piston rod...

USEFUL INFORMATIONTechnical data m Q. O CO \ ro a ro a TEMPERATURE INFLUENCE ON PRESSURE In real conditions, gas springs produce heat due to the seals friction. This is called JOULES effect. Gas springs maximum operating temperature is 70°C. Nitrogen pressure will increase with the temperature. P / t = P / T initial initial final i => Pf = Pi x Tf/Ti ; T = temperatures in °Kelvin (°C + 273) ► RG 3000 force is 2950 kgf and initial pressure Pi = 150 bar at 20 °C At 70 °C : Pf = 150 x (70+273)/(20+273) = 150 x 1.17 = 175 bar The pressure increase is 17 %, we can calculate the force at 70 °C...

USEFUL INFORMATION Technical data ADVANTAGE OF GAS SPRINGS VS. COIL SPRINGS MORE FORCE IN LESS SPACE : One Super compact RGC 4700 C25 (body ø 75 mm, stroke 25 mm) against 14 Coil springs, extra heavy load, ø 50 mm with 25 mm pre-loading. Reduction of required surface area, 44 cm2 for the cylinder against 274 cm2 for the coil springs. Reduction of height, only 135 mm for the cylinder against 280 mm for the coil springs. Reduction of volume required, only 596 cm3 for the cylinder against 7963 cm3 for the springs. Reduction in the number of retaining device to pre-load, guide and seat. None...

Technical data LARGE FORCE ON CONTACT : All nitrogen gas springs provide high and known initial forces on contact from 22.5daN (for the RG19 - 22.5 with a body ø 19mm) up to 18300daN (for the RGC 18300 with a body ø 150mm). Any mechanical wire compression spring requires a pre-load to obtain such initial forces. Benefits : • No pre-load. • Easier and quicker fitting. • Reduction of cost BALANCED AND CONTROLLED FORCES : Nitrogen cylinders linked with hoses will guarantee a balanced system ensuring the same force in each cylinder. This is not possible by using coil springs since their working...

Gas Spring and Pressure Equipment Directive 2014/68/EU 1] GOALS AND CONCERNED APPLIANCES : The objective of this directive is to ensure the safety of pressurized devices at all stages of production (design, manufacturing, traceability of materials, tests and marking). This directive concerns every pressure equipment (steam generators, pressurized tanks, pipings, hydraulic cylinders, etc.) with a minimal pressure of 0.5 bars above the atmospheric pressure. • The Pressure Equipment Directive 2014/68/EU is the European relevant directive. It replaces the PED 97/23/EC. • The decree 2015-799 of...

MICRO GAS SPRINGS RG 19 • Body diam. 19 mm • Inflating valve on the bottom • Cannot be used in piping system • Different force depends on different pressure MRG • Body diameter: 25 mm • Inflating valve on the bottom • Cannot be used in piping system • Force can be changed by changing the pressure RMG • Body diameter: 25 mm • Inflating valve on the top of the piston rod • Cannot be used in piping system • Force can be changed by changing the pressure • Double sealing for heavy duty RMGE • Bottom thread M8 • Inflating valve on the top of the piston rod • Cannot be used in piping system •...