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Hydraulic cylinders

Hydraulic cylinders. Cylinder types: piston, double acting. x. Valves. Symbol. Pressure relief valve. A. C. k. F spring. p sys. Q p. Pressure relief valve. Curtain surface: Circumference ∙ height = k ∙ x = A c. Force equilibrium:. Theoretical basics. (1). Bernoulli equation:.

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Hydraulic cylinders

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  1. Hydraulic cylinders Cylinder types: piston, double acting Hydraulic and Pneumatic Systems

  2. x Valves Symbol Pressure relief valve A C k Fspring psys Qp Hydraulic and Pneumatic Systems

  3. Pressure relief valve Curtain surface: Circumference ∙ height = k ∙ x = Ac Force equilibrium: Theoretical basics (1) Bernoulli equation: (2) (3) Qrv depends nonlinearly on x or if we express x from (1) then: (4) Hydraulic and Pneumatic Systems

  4. Pressure relief valve Let be the pressure when the valve just opens (x = 0) Theoretical basics:  subst. to (4) (5) (5) is valid from x = 0 to x = xmax, xmax being the displacement when the spring is completely compressed If p > pmax : Hydraulic and Pneumatic Systems

  5. Qrv psys pmax negative part: physically impossible belongs to xmax Pressure relief valve Theoretical basics: Hydraulic and Pneumatic Systems

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