| 摘要 |
<p>A pressure limiting valve (1) with flow rates of 2000 litres per minute and over has a valve piston (10) in the form of a tubular sleeve (20). With the attached control piston (60), this valve piston (10) forms a structural unit in which the control piston (60), the diameter of which is correspondingly smaller, is loaded by means of a spring plate (26) and a valve spring (11) which is adjustable and predetermines the force at which the valve (1) opens. The specially stepped construction of the valve piston (10) and its large diameter are possible because use is made of special kinds of sealing rings (19, 51 and 75) bearing on the outside on the largediameter valve piston (10) and on the control piston (60) without hampering their movement significantly through friction. A good seal is nonetheless ensured because the sealing rings used (19, 51, 75) are very hard but create little friction and lie closely against the valve piston (10) and the control piston (60) owing especially to the construction of the annular groove (50, 55 and 76) with a bevel (54, 58, 77).</p> |
