Installation instructions

Connecting the mating, self-locking stop valves

Option B When the internal and external threads are correctly joined up to the stop, the valves are screwed together using screw and torque wrenches with the fol lowing torques:

Cross hole With lock (or spring pin)

Size I 34 Nm (±3 %),

Size II 40 Nm (±3 %).

After removing the protective caps from both valves, screw the valves on the re frigerant lines hand-tight as far as they will go onto the mating fittings on the components. Make sure that the stop valves are visu ally in good condition, free of foreign particles (sand, etc.) and that the valves are aligned with each other. Option A When the internal and external threads are hand-tightened together as far as they will go, the enclosed spring pin is pushed into one of the three cross holes until it clicks into place. The spring pin can be replaced by a single-use lock PS-LD(W)*1 (optionally available) to prevent the fittings from separating unnoticed. Special tools are required to open these locks (see EN 317-1:2018-4, point 3.1.7).

We always recommend option A . This prevents accidental overstressing of the material and its possible conse quences (see CS Newsletter 2023-I).  Connections may only be sub jected to forces resulting from the pres sure of the system and the connection being made. It has to be ensured that no tensile, bending or torsional forces act on the connection from the outside. Mass or tensile/compressive forces that may occur during assembly, handling, transportation, operation or mainte nance have also to be taken into ac count. Pipings with flared connections must be adequately secured (cf. EN 378-2:2018-04).

* 1 to meet the requirements of EN 378 1, No. 3.1.7 for (hermetically) sealed systems

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