| 摘要 |
FIELD: mining industry. SUBSTANCE: small-size X-mass tree consists of cross-member, tubing head, shutoff device, regulated union, pressure gages. Tubing head is made in tee whose central channel accommodates, coaxially with side channel, turning plug cock with valve gate and changeable seats. Main channel in plug is stepwise in shape and has longitudinal recess on the side of lower end. EFFECT: simplified design and increased maintainability. |
