Hydraulic snubbers
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HYDRAULIC SNUBBERS Snubbers and accessories

QUIRI HYDROMECANIQUEWHO ARE WE ? QUIRI Hydromecanique is specialist in design and manufacturing of components and mechanical installations that use high-pressure fluids for process plant applications, special cylinders, dampers, snubbers, hydraulic power units, control systems,... We apply our know-how and experience to small and medium scale manufacture of products with high technical added-value, and to installations that are specifically adapted to our client’s needs. To provide our clients with complete solutions. QUIRI Hydromecanique retains control over all the specialist skills...

Snubbers TABLE OF CONTENT www.quiri.com APPLICATIONS 02 QUIRI HYDRAULIC SNUBBERS 03 Design of QUIRI snubbers Valve Painting Snubber selection criteria STANDARD SNUBBERS (DAST) 05 Technical specifications / Dimensionnal characteristics COMPACT SNUBBERS (DACP) 09 Technical specifications / Dimensionnal characteristics LOW TEMPERATURE SNUBBERS (DALT) 13 Technical specifications / Dimensionnal characteristics LARGE BORE SNUBBERS (DALB) 17 Technical specifications / Dimensionnal characteristics ACCESSORIES FOR SNUBBERS 21 SNUBBER DYNAMIC TEST BENCH 25 Description...

The snubbers are dynamic linear supports designed to limit unwanted sudden movements of components such as: • Pipes • Tanks • Control valves • Steam generators • Safety valves • Pumps, motors, etc. The snubbers enable slow movements due to thermal dilatation in both directions. When a dynamic event which could be harmful to the installation occurs, the snubbers lock and transfer the energy to the fixed structure. Once the disturbance has passed, the device returns to its initial state and enables slow movements once again. In that way, the snubbers provide temporary additional support to...

Snubbers QUIRI HYDRAULIC SNUBBERS Design of QUIRI Snubbers Raw materials All raw materials are forged or rolled steel. This technology reduces the risk of porosity and failure, compare to molded and welded steel. QUIRI snubbers are designed to withstand the hot, humid and irradiated atmospheres prevalent in nuclear and thermal power plants. Operation mode Type A mode: Lock and drift Valves V1 and V2 allow a limited fluid flow between chambers CH1 and CH2. The drift speed after locking is generally set from 0.1 mm/s to 2 mm/s or as requested. The drift movement is required to relax a pipe...

Snubbers QUIRI HYDRAULIC SNUBBERS Valve Lockup valve defining the lockup velocity are tested one by one in our factory. Lockup valves are designed and sized to be independent from the fluid viscosity and temperature. QUIRI uses Self Cleaning Lockup Valve. The self cleaning lockup valve (SCLV) ensures 2 functions: block and drift. The integration of both functions is made by machining a «V» shape slit on the working area of the valve so that: • The SCLV is never totally closed to ensure the decompression • After drift trough the «V» shape slit, the pressure will decrease and allows the...

Standard snubbers (DAST) TECHNICAL SPECIFICATIONS www.quiri.com Introduction Standard Snubbers (DAST) are used for all applications in conventional plants. Snubbers are made with standard components, mainly available on stock. Raw materials Stainless steel rod with chemical nickel coating or chrominium Body an internal parts in high quality carbon steel, surface protection by painting. Dynamic characteristics at ambient temperature, 15°C to 35°C Hereofter standard values, (others available on demand) Fn is the Nominal load of the snubber Locking speed: 2 mm/s to 10 mm/s or as requested Drag...

Standard snubbers (DAST)TECHNICAL SPECIFICATIONS Ed :07/2017 Permissible load in k N The permissible load in terms of dynamic stress in the table below has been calculated in accordance with RCCM code vol. H level S1. Load definition : Normal/Disturbed - Level A/B: Here are estimated all loads due to normal functioning, including normal transitional regime during operation of the plant. And also some disturbed loads due to normal functioning of the plant. Emergency : Level C: Here are estimated all loads outside to normal operation due to particulars situations, possibly safety shutdown...

Standard snubbers (DAST) DIMENSIONAL CHARACTERISTICS www.quiri.comDimensions ► Other load, stroke or characteristics on demand. QUIRI Hydromecanique - FRANCE Phone : +33 3 88 04 84 00 Fax : +33 3 88 04 84 01 Email : quiri.hydro@quiri.com

QUIRI Hydromécanique - FRANCE

Compact snubbers (DACP) TECHNICAL SPECIFICATIONS www.quiri.com Introduction Compact Snubbers (DACP) are used in conventional plants, for particular sizing solution. Snubbers designed also for nuclear applications, fully respect all nuclear norms and standards, qualified for nuclear applications. Special fabrication on demand. Raw materials Stainless steel rod with chemical nickel coating or chrominium Body an internal parts in high quality carbon steel, surface protection by painting or chimical nickel coating. If required with all nuclear tracability Dynamic characteristics at ambient...

Compact snubbers (DACP)TECHNICAL SPECIFICATIONS Ed :07/2017 Permissible load in k N The permissible load in terms of dynamic stress in the table below has been calculated in accordance with RCCM code vol. H level S1. Load definition : Normal/Disturbed - Level A/B: Here are estimated all loads due to normal functioning, including normal transitional regime during operation of the plant. And also some disturbed loads due to normal functioning of the plant. Emergency : Level C: Here are estimated all loads outside to normal operation due to particulars situations, possibly safety shutdown...

Compact snubbers (DACP) DIMENSIONAL CHARACTERISTICS www.quiri.comDimensions Type ► Other load, stroke or characteristics on demand. QUIRI Hydromecanique - FRANCE Phone : +33 3 88 04 84 00 Fax : +33 3 88 04 84 01 Email : quiri.hydro@quiri.com

QUIRI Hydromécanique - FRANCE