Hawle extension spindles (type H) serve the purpose of operating Hawle pipe drilling saddles type Hawlinger® in underground pipeline construction.
Via the round threaded cover the extension spindle is screwed clockwise onto the round thread (round thread adaptor) of the shut-off valve.
This has the advantage that the torque is transferred from the coupling socket to the spindle square, making the additional pinning of the coupling socket of the extension spindle and the spindle of the shut-off valve unnecessary.
Especially in case of cohesive soils care shall be taken that the valve and the extension spindle are properly back-filled with sand to ensure frost resistance.
For operation, operating keys are suitable. Extensions and similar are not permitted.
Note: Hawle pipe drilling saddles type Hawlinger® are shut off via one half revolution (180°). The relevant marking (indicator plate) is located on the extension spindle below the spindle head.
For telescopic extension spindles see model no. 960-01.