I have a bronze gate valve whose spec sheet says it conforms to MSS SP-80 Type 2. However, the project standards specify that the gate valve must be MSS SP-80 Type 1. What is the difference between the two types, anyway?

FYI, the spec sheet for the particular valve in question can be found here.

  • This seems a bit esoteric for DIY home improvement. Are these boiler parts? – HerrBag Jun 18 '13 at 13:26
  • @HerrBag Actually, I work for a mechanical contracting firm. I'm using these as just regular hydronic valves. The reason I'm asking this here, is because there was nowhere else to ask. – AJMansfield Jun 18 '13 at 13:33

It seems a Type I is a globe valve and the type II is an angle valve.

enter image description here

  • That can't be right, because I have another valve here that is a MSS SP-80 Type 1, and it's still a gate valve. – AJMansfield Jun 18 '13 at 13:35
  • I found the chart here, under "Valve specifications Federal" turnkeyips.com/specifications.html – HerrBag Jun 18 '13 at 13:40
  • I went over the chart, and if you look at some items lower down, what I'm after is under Federal Specification WW-V-54d Class B, Type 1. – AJMansfield Jun 18 '13 at 13:47
  • obviously, MSS SP80 type 1 isn't a valve type, per se, since both a gate and a globe valve qualify. – HerrBag Jun 18 '13 at 13:54
  • Some other inconsistency I noticed: the spec book is asking elsewhere for type 3 bronze globe valves, but there is no type 3 bronze globe valve in the table, it skips right to type 4. – AJMansfield Jun 18 '13 at 14:06

I just figured out what the difference is:

  • Type 1 valves have non-rising stems
  • Type 2 (or 3) valves have rising stems

It's basically whether or not the handle moves vertically when you turn it.

  • WW-V 54d seems to be the determining spec for gate valves. – HerrBag Jun 18 '13 at 14:01
  • @HerrBag Yes, at least for bronze ones. – AJMansfield Jun 18 '13 at 14:02

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