Pressure limiting valve with stepped or double piston

Details Pressure limiting valve with stepped or double piston Pressure limiting valve with stepped or double piston

F - Mech Eng,Light,Heat,Weapons

16

K

137/65

F16K 17/04 (2006.01)

Patent

CA 2033066

(57) Abstract The feature of a pressure limiting valve with flow rates of 3000 litres per minute and more is a cylindrical piston (10) ar- d to slide longitudinally in the valve casing (2) against the force of a spring (11). The valve (1) is divided into two chambers (46, 47). With the attached control piston (60), the valve piston (10) forms a structural unit in which the control piston with its correspondingly smaller diameter is loaded via the spring cap (26) and the valve spring (11). The valve spring (11) is adjustable so that the opening point of the pressure limiting valve (1) may be preset. The special design of the stepped valve piston (10) with the control piston (60) makes it possible to use relatively weak and small valve springs (11), thus making the entire valve compact. The response of the pressure limiting valve is ensured owing to the stepped design of the valve piston (10)/control piston (60) and the sealing rings (19, 51) used, which are fitted on the outside of the large diameter valve piston (10) without perceptibly hamper- ing its movement through friction. Sealing is nevertheless ensured because the sealing rings (19, 51 and 75) used are very hard and create little friction.

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