I am putting together a new manifold. The sealing is a metal to metal seal. The surfaces have a high finish - but I cannot get them to seal up. What I am thinking is - I are threading in a valve and the sealing is happening between a surface on the valve and a stationary surface in the manifold body. Is this even possible? Does the relative motion between the valve and the stationary body cause galling at high surface forces (valve being torqued into body)? Will this always be a low yield process? I are getting less than 50% yield (less than 50% of the units I build pass leak testing on the first torquing). When I go back and retighten - they sometimes seal and sometimes they do not. My question is twofold:
1. Is this just a bad sealing arrangement?
2. Is there something I should be putting on the valve before installing it - like a lubricant or sealant?
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