Mooney Series 21 Regulator Instruction Manual | 7
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Regulator Assembly - Series 21 & 21S (cont’d)
No Spacer
Figure 15
Stack the Return Spring, Stem Guide, Orifice Spring, Plug
and Stem, Orifice, Orifice O-Ring, and Back-up Washer on
the Bottom Cap.
8. Lubricate both Body Insert O-Rings with Parker O-Lube1 (or
equivalent Petroleum based Lubricant) and install on Body
Insert (Cartridge).
9. Body Insert Assembly: Lift Bottom Cap complete with valve
mechanism assembly and insert into Body Insert. The
Orifice Spring should snap the Orifice into place as the
Bottom Cap is screwed into place. Check the assembly by
pushing the Stem against a hard surface to make sure it
moves freely and returns to the extended position.
Measure the stem extension. (See Figure 14)
Pressure Reducing mode: 0.32 inches (8.12 mm)
Figure 16
Insert the assembly into the Body Insert - the orifice should
“snap” into place.
10. Lubricate Stem O-Ring with Parker Super-O-Lube® (or
equivalent Silicon Lubricant) and slip over Stem.
11. Insert Body Insert into Regulator Body and screw into place
snugly.
Stem O-Ring
Figure 17
Insert Body Insert (Cartridge) with lubricated Stem O-Ring
into the Regulator Body.
Note: Over tightening an O-Ring Joint will not improve the
seal. Screw in until metal parts make contact and snug
slightly.
12. Regulator Assembly is now complete.
Regulator Assembly - Series 21H & 21HS
Note: The high pressure constructions (Series 21H & 21HS)
differs from the Series 21 & 21S with the addition of a
diaphragm spacer assembly that limits the effective area of
the diaphragm and doubles the spring range of the black
and green springs.
1. Diaphragm Assembly:
Install the Regulator Diaphragm
with convex side toward Diaphragm Plate and Main Spring
(Refer to Figure 18). Tighten nut on the Diaphragm Retainer
to approximately 5 to 6 ft-lbs (6.78 - 8.14 n-m) torque.
Figure 18
Insert Body Insert (Cartridge) with lubricated Stem O-Ring
into the Regulator Body.
Note: Over tightening will distort the Regulator Diaphragm.
