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SECTION 105-R
VILTER MANUFACTURING CORPORATION
February 2001
PAGE 23
Replaces
February 1985
440 VMC COMPRESSORS
February 1985
PISTON AND CONNECTING ROD ASSEMBLY AND SAFETY HEAD REPLACEMENT PARTS
1000 RPM HIGH STAGE AND TWO-STAGE COMPRESSORS
AND 1200 RPM BOOSTER COMPRESSORS
NO. REQ. PER COMPRESSOR SERIAL NO.
ITEM DESCRIPTION
SINGLE STAGE
TWO-
STAGE
PART
NO. OF CYL.
2 4 6 8 12 16 6 12 FROM THRU NUMBER
519 Springs, Valve (Volute) 8 16 24 32 - - - - - - - - 0+ 2198 31915A
519 Springs, Valve (Helical) 8 16 24 32 48 64 24 48 2199+ Present 33803A
520 Yoke, Safety Head 2 4 6 8 - - - - 6 12 0 Present 31941B
520 Yoke, Safety Head - - - - - - - - 12 16 - - - - 2656 Present 31941B
521 Spring, Safety Head 2 4 6 8 12 16 6 12 0 Present 31882A
NOTES:
+ 1000 RPM high stage and VMC booster compressors with Serial No.’s 2198 and below have volute springs, with the exception
of Serial Nos. 2160, 2163, 2168, 2169, 2182, 2183, 2184, 2185, and 2186, which have helical springs. All 1000 RPM high
stage and VMC booster compressors with Serial Nos. 2199 and above have helical springs. The old type volute springs are
available. However, the safety head for volute springs is not available. If a replacement safety head for volute springs is
needed, it will be necessary to purchase the helical spring as well as the safety head for helical springs. When this conversion
is made, it is not necessary to make the conversion on all cylinders of the compressors. It may be well to do so to eliminate
confusion in the future.