| 摘要 |
An auxiliary non-return valve 16 for mounting to a further non-return valve (8, Fig. 1) of a main valve (2, Fig. 1) comprises a body 58 having a through-bore 60 defining a longitudinal axis, a valve seat 66 and a fitting 70 for mounting to the further non-return valve 8. A valve stem 30 is mounted in the bore 60 and has a valve member 30a to seat on the valve seat 66 and a tip 30b, and is moveable axially to project into the further non-return valve 8 and actuate the further non-return valve. A biasing member 64 urges the valve member 30a against the valve seat 66. A seal 68 seals the auxiliary non-return valve 16 against the further non-return valve 8 and retains pressure within the bore. A stinger assembly 11 is provided to inject lubricant or sealant into the main valve 2 via the auxiliary non-return valve 16. |
