| 摘要 |
FIELD: engines and pumps. ^ SUBSTANCE: valve body incorporates two valves, the first one, relief valve, is arranged axially with and inside the second valve, a shutoff-and-control valve with a stepwise OD. The valve shut-off element is fitted in the seat furnished with a sealing element. Ahead of the aforesaid blank-bottom seat, tubular elements furnished with radial; holes are arranged. On opening the said shot-off element, the seat sealing element is unloaded, while in controlling the pumped medium flow rate opening, the pressure difference is uniformly distributed between the three stages along the entire travel of the shutoff-and-control valve. ^ EFFECT: higher reliability and longer life. ^ 1 dwg |
