The valves, ranging would be gate or globe valves, sizes of 8-12" for steam condensate service, sub-atmospheric pressure, ~80 deg. C/ 176 deg. F.
Normally for mere subatmospheric pressure valves as in valves that connect to powerplant condensers, normal industrial-type valves are used.  It is common to use a lantern-gland packing and to flood the lantern-gland with water.  Thsi reduces leakage, and anything that does leak into the process is Gland Seal Water.  Also particulrly with power plants, air inleakage causes accelerated corrosion, and by supplying gland-sealed valves they avoid the corrosion problems.  The gland-seal water system uses water that is clean enough so that it will not otherwise corrupt the chemistry of the system.

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