3 years ago

Diaphragm Accumulators - Airline Hydraulics

Diaphragm Accumulators - Airline Hydraulics


HYDAC Diaphragm Accumulators Index Page 1. Description 3 Introduction 3 Construction 3 2. Applications 4 3. Technical Data 6 Operation 6 Technical Specifications 6 Temperature Effect 6 Formulas for Sizing Accumulators 7 Sizing Example 7 4. Installation Requirements 8 5. Model Code 9 6. Welded Type (non-repairable) Specifications 10 7. Threaded Type (repairable) Specifications 11 2

1. DESCRIPTION INTRODUCTION HYDAC diaphragm accumulators utilize the compressibility of a gas (nitrogen) in storing hydraulic energy. The gas is required because fluids are practically incompressible and thus, can not store energy by themselves. The diaphragm is utilized to separate the gas and the fluid sides of the accumulator The diaphragm accumulator functions by drawing in fluid from the hydraulic circuit when the pressure increases and thus, compresses the gas. It returns this energy to the circuit as the pressure decreases by the expansion of the gas. A poppet is incorporated into the diaphragm to prevent its extrusion through the fluid port. HYDAC manufactures two types of diaphragm accumulators: • welded (non-repairable) • threaded (repairable) These have been successfully applied to both industrial and mobile applications in energy storage, maintaining pressure, leakage compensation, and vehicle hydraulic systems (e.g. brake and suspension). CONSTRUCTION Welded Type gas valve accumulator shell diaphragm poppet fluid port It consists of: • an electronic beam welded shell with gas charging valve or alternately, completely sealed. Fluid ports are available in various thread configurations. • a flexible diaphragm to separate the gas and fluid sides. • a poppet. Threaded Type gas valve accumulator shell locking ring diaphragm poppet fluid port It consists of: • a forged upper section with the gas valve. • a forged lower section with the fluid port. • a locking ring to fasten the upper and lower sections together. • a replaceable, flexible diaphragm to separate the gas and fluid sides. • a poppet Diaphragm Materials Not all fluids are compatible with every elastomer at all temperatures. Therefore, HYDAC offers the following choice of elastomers: • NBR (Standard Nitrile) • LT-NBR (Low Temperature Nitrile) • ECO (Epichlorohydrin) • IIR (Butyl) • FPM (Fluorelastomer) • others available upon request. Corrosion Protection HYDAC offers internal and/or external protective coatings. If this is insufficient, stainless steel is also available. Mounting Position Diaphragm accumulators by design may be mounted in any position. In systems where contamination is a problem, we recommend a vertical mount with fluid port oriented downward. System Mounting HYDAC diaphragm accumulators are designed to be screwed directly onto the system. We also recommend the use of our mounting components, refer to Mounting Components brochure # A 3.502, to minimize risk of failure due to system vibrations. 3

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