Dual swivel consists mainly of shell, central pipe, packing device, pneumatic motor, gooseneck, and bail, etc. The central pipe is fitted in the shell through bearing and upper & lower cover. The lower end of central pipe is connected to drill pipe joint, and the upper end is connected to packing device. The bail is connected to shell by bail pin, and hung on rotary hook. The gooseneck is fitted on the top of upper cover with its outer end connected to vibration hose. A Packing device is installed between the gooseneck and central pipe, so that enable the high pressure mud to flow to the central pipe and ensure it is sealed and not leaked. The pneumatic motor is mounted onto the upper cover, which will drive the central pipe to rotate after slowing down by gas control friction clutch and gear, delivering its lock clasp capability.
drill swivel Main Parameters

Model	SL90	SL120	SL135
Max. Static load lb(kN)	202320(900)	269760(1200)	303480(1350)
Max. RPM(r/min)	300	300	300
Max. working pressure psi(MPa)	3932.5(27.5)	5005(35)	5005(35)
ID of stem in.(mm)	2.36(60)	2.13(54)	2.24(57)
Thread for connection with stem	4-1/2″ FH-LH	4-1/2″" DP thread LH	4-1/2″ REG-LH
Thread for connection with kelly	6-5/8″ REG-LH	3-1/2″ REG-LH	6-5/8″ REG-LH
Overall dimensions in.(mm)	--	74.72×24.72×28.43(1898×628×722)	90.20×25.12×25.51(2291×638×648)

Model	SL160	SL225	DSL160
Max. Static load lb(kN)	359680(1600)	505800(2250)	359680(1600)
Max. RPM(r/min)	300	300	300
Max. working pressure psi(MPa)	5005(35)	5005(35)	5005(35)
ID of stem in.(mm)	2.24(57)	2.99(76)	2.24(57)
Thread for connection with stem	4-1/2″ REG-LH	6-5/8″ REG-LH
Thread for connection with kelly	6-5/8″ REG-LH	6-5/8″ REG-LH	3-1/2″ IF-LH
Overall dimensions in.(mm)	85.63×30.75×25.98(2175×781×660)	107.87×39.76×33.86(2740×1010×860)	94.4×44.2×25.98(2397×1123×660