| 摘要 |
FIELD: physics, measuring. ^ SUBSTANCE: invention can be applied in hydraulic and gas systems with overload pressures considerably exceeding working pressure. Threshold data unit of pressure contains case, immobile adjustable contacts and sensitive body interreacting through rod and spring with the mobile current-carrying contact. On rod the groove is executed. The mobile current-carrying contact is disposed on spin axis supplied with the lever, rigidly anchored on it with possibility of introduction of the lever in a groove of the rod providing transformation of progress of sensitive body in circumrotatory motion of the mobile current-carrying contact. The sensitive organ is executed in the form of piston drawn in by spring with flange and stage pusher, and the pusher step is executed on the length providing possibility of travel of the piston within admissible squeezing of its drawing in spring. In a piston body the sealing device isolating a vacuity with the mobile current-carrying contact from a working environment, and between a flange of the piston and the case - an additional sealing device is erected. The spring which is drawing in the piston, is chosen with effort, equivalent to an operation threshold. Transmission of interaction of sensitive organ with the mobile current-carrying contact is carried out through stage pusher. ^ EFFECT: increase of reliability of device. ^ 1 dwg |
