Parr Instrument Bottom Drain Valves - Manual (Page 2)

Bottom Drain Valves Models A465VB, A465VB2, A485VB & A560VB
Operating Instruction Manual
- 2 -
Assembly of Bottom Drain Valves
1. Before assembly, all parts of the valve should be clean and in good condition.
Note: Assembly of the valve is easier if it is removed from service and oriented so that the threads going into the
cylinder face downwards.
2. Install a PTFE upper seal into the cavity in the valve body. The plunger may be used to help with the
installation.
3. Install a small compression ring behind the PTFE upper seal.
4. Install the pin into the groove. The pin will rest on the upper compression ring.
5. Install one larger compression ring followed by a PTFE upper seal, and then the final compression ring is
installed into the proper recesses in the valve body.
6. Apply generous amounts of lubrication using a high temperature thread lubricant. See the “Lubrication of the
Bottom Drain Valves” section in this manual. Apply lubrication to the following threads:
The outer threads of the plunger.
The inner threads of the retainer.
The inner threads of the valve body where the retainer will go.
The outer threads of the retainer.
7. Install the jam nut as far as it will go onto the threads of the retainer.
8. Screw the plunger about half of the way into the retainer.
9. Guide the retainer and plunger combination into the valve body until the threads of the retainer engage with
the valve body.
10. Continue tightening the retainer until it is hand tight.
11. Install the handle onto the plunger with the pin and set screw.
12. Rotate the handle clockwise until the plunger extends as high as it will go.
13. Loosen the plunger by turning the handle counterclockwise one complete turn.
14. Tighten the retainer into valve body to the following torque:
A465VB 20 ft/lbs
A465VB2 20 ft/lbs
A485VB 15 ft/lbs
A485VB2 15 ft/lbs
A560VB 20 ft/lbs
15. Tighten the jam nut on the retainer until it comes into contact with the valve body.
16. Tighten the valve handle clockwise until the plunger is in the fully engaged position.
Lubrication of the Bottom Drain Valves
Lubrication of the threads should be done with a nickel based high temperature thread lubricant. Lubricate all inner
and outer straight threads on the valve body, retainer and plunger.
The frequency of lubrication depends on the amount of use the valve receives. If the valve sits for a long period of
time (one or more months), it should be lubricated before use. If the valve is used daily, then lubrication may be
required once a week.
Applications that include operating temperatures of 250°C and above will require more frequent lubrication of the
valve threads.