Magnum Venus Plastech Powerhead MPH_VPH–4250 Series - Manual (Page 18)

MPH / VPH – 4250 Series Manual
Rev. 05/2012 Page | 18
Valve Block Reassembly:
NOTE: Removable thread lock compound will be required for reassembly. If either
one of the two Valve Rods unscrewed from the Valve Poppet (MPH-2547 or VPH-
2504) during disassembly, put one to two drops of removable Loctite
® on threads
and assemble.
1. Set the Valve Rod assembly into the Lower Valve Block (MPH-2516).
NOTE: The MPH-4250 has a long and short Valve Rod, insert the short Valve Rod
(MPH-2519) into the Lower Valve Block. Rotate the Valve Rod so the hole in the
Valve Poppet aligns with the Pipe Plug (PF-AP-04-SS) bore. Insert 7/32” hex
wrench through the pipe plug bore and into the hole in the Valve Poppet to hold
Valve Rod assembly in place.
2. Slide the Upper Valve Block (MPH-2515 or VPH-4257) into the Lower Valve Block
(MPH-2516) and align properly. Screw the Button Head Cap Screw (F-BHCS-04C-
08-SS) into the Lower Valve Block.
3. Use one to two drops of removable thread lock compound in the female threads of
the Valve Pistons (MPH-2517). (See Figure 3) Shake off any excess thread lock
compound and screw onto either Valve Rod end. Repeat for process for the
second Valve Piston and remove hex wrench from Valve Block.
4. Use either Teflon tape or Pipe compound on the Pipe Plug (PF-AP-04-SS) threads
and screw into the Lower Valve Block.
Figure 3
Use only one to two drops of thread lock compound in
valve piston threads.
5. Insert the Diaphragms (MPH-2529) into the Upper and Lower Valve Blocks with
the outside leading edge of the Diaphragms facing out. Push the Diaphragms all
the way down into the Valve Block bore.