hi to all,Ball Valvesi have a question regarding Chack valves, what means for a check valve the term "retainer less design"?thanks for all best regards.Check Valves The retainless design means that they do not drill completely through the body of the valve to enable installation of the hinge-pin and stop-pin of a dual-plate check. Butterfly Valvescom/en/gate-valve.html">Gate Valves Instead of drilling through, they machine out a recess. This is pretty standard design (retainerless) by most manufacturers. See API-594 for some pics of these pins through the body and google retainerless for pics of the variation. thanks for your explanation. Globe ValvesI have found more info about "retainerless" on web. On API 594 valves droawings are all with the retainers passing through the valve body.Many thanks Vincenzo .

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