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Info Sheet 200 Series, 1 of 1
Maintenance, Parts and Assembly for
SV Series Seacocks
The Concept: GROCO SV series seacocks were waterproof grease. Do not use petroleum based
manufactured for the marine industry between 1960 grease as it will chemically attack the rubber.
and 1993. Production was discontinued in favor of
the presently manufactured BV, SBV, and SBV-P Some owners may prefer to replace the drain plug
series Full Flow Ball Valves. on the side of SV seacocks with a stainless steel
grease zerk (the drain plug thread size for all SV
SV series seacocks operate on the simple seacocks is 1/8"-27 NPT) .
"expanding plug" principle. A wingnut on the back of
each valve is hand-tightened when in the valve is in Winterization: Freezing will damage the seacock. To
the desired open or closed position. Tightening the properly winterize the valve, move the handle to the
wingnut expands the rubber plug, thus sealing the closed position, and tighten the wingnut. Remove
valve. the drain plug on the side of the valve to drain the
water from the valve body. Remove the hose or pipe
Operation: When a change in valve position is at the top of the valve to drain the water from the
desired, the wingnut is loosened enabling the connected plumbing.
operator to turn the valve handle to the new position.
Re-tighten the wingnut each time. Upgrading: Many boat owners prefer the simplified
operation of GROCO BV, SBV, SBV-P or BVS series
Note: While the wingnut is loose the seapage of a ball valves (No wingnuts to loosen and tighten, and
small amount of water is normal. no temporary water seepage). Your old SV series
seacock may be replaced with a GROCO ball valve,
Maintenance: Years of maintenance-free service can Safety Seacock, or seacock/strainer combination.
be expected. If the valve becomes difficult to turn, at
haul-out remove and inspect the valve plug. The
rubber should be free of bumps that might be
created due to extended periods of non-use. (The
pressure exerted by the tightened wingnut forces
rubber into the drain plug hole and into the inlet and
outlet ports, and older plugs do not quickly return to
their original shape).
Bumps may be removed with light sanding. Replace
plugs with excessive bumps.
Lubrication: Lubrication is not normally required, but
may aid in the easy operion of older valves. Remove
© 1999 GROSS MECHANICAL LABORATORIES, INC. ALL RIGHTS RESERVED.
the valve plug and coat lightly with silicon based
Item Name Qty SV-500 SV-750 SV-1000 SV-1250 SV-1500 SV-2000 SV-2500
1 Wingnut 1 SV-502 SV-752 SV-752 SV-1502 SV-1502 SV-2502 SV-2502
2 Body 1 SV-500-B SV-750-B SV-1000-B SV-1250-B SV-1500-B SV-2000-B SV-2500-B
3 Disc 1 SV-503 SV-753 SV-103 SV-1252 SV-1503 SV-2003 SV-2503
4 Plug 1 SV-506 SV-756 SV-1006 SV-1256 SV-1506 SV-2006 SV-2506
5 Handle 1 SV-506-A SV-756-A SV-1006-A SV-1256-A SV-1506-A SV-2006-A SV-2506-A
6 Cover 1 SV-501 SV-751 SV-101 SV-1251 SV-1501 SV-2001 SV-2501
7 Bolt 2 or 4 1420X12HB 1420X12HB 1420X12HB 1420X12HB 1420X12HB 1420X12HB 1420X12HB
8 Lockwasher 2 or 4 14ETB 14ETB 14ETB 14ETB 14ETB 14ETB 14ETB
9 Drain Plug 1 1827HB 1827HB 1827HB 1827HB 1827HB 1827HB 1827HB
For service assistance or information, call (410) 712-4242. Ask for Seacocks Service Department.
7240 Standard Drive x Hanover, MD 21076 x www.groco.net
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