User Guide

5. Apply pipe dope sparingly to all but the last two threads of a properly threaded, reamed,

and cleaned pipe. Make sure that pipe chips, scale, etc. do not get into the pipe since

this material may lodge in the valve seat and prevent proper closing and opening of the

valve.

6. Start the joint by hand screwing the pipe into the valve. If the thread engagement feels

“right,” turn the pipe by hand as far as it will go.

7. Use a pipe wrench to fully tighten the valve to the pipe. Do not over tighten or strip

threads. See Table-8 and Figure-3 for the normal engagement length of the threads.

Figure-4 shows a means of tightening the pipe so that the valve is not twisted or

crushed.

Table-8 Normal Thread Engagement Between Male Pipe Thread and Valve Body.

Figure-3 Normal Thread Engagement.

Figure-4 Installation of Screwed End Valves.

Valve Size Inches

(NPT)

Normal Engagement

Valve Size Inches

(NPT)

Normal Engagement

1/2" 1/2" 1-1/4" 11/16"

3/4" 9/16" 1-1/2" 11/16"

1" 11/16" 2" 3/4"

Right Wrong

Pipe threads too long.

Pipe interferes with seat.

Use pipe wrench to

prevent valve from turning.

Tighten pipe using

this pipe wrench.

Valve

Assembly