Installation, Op ration, & S rvic Instructions
SAFETY
INSTRUCTIONS
This saf ty al rt symbol will b us d in this manual to draw
att ntion to saf ty r lat d instructions. Wh n us d, th saf ty
al rt symbol m ans ATTENTION! BECOME ALERT! YOUR
SAFETY IS INVOLVED! FAILURE TO FOLLOW THESE
INSTRUCTIONS MAY RESULT IN A SAFETY HAZARD.
DESCRIPTION
Th B ll & Goss tt DB diff r ntial by-pass valv is us d in
syst ms wh r various h ating loads may b simultan ously
xclud d from th circuit b caus of th closing of control or
zon valv s.
It nsur s a r circulation proportional to th numb r of valv s
which clos , avoiding nois s and maintaining th h ad of th
pump at a constant valu .
TECHNICAL SPECIFICATIONS
Conn ctions: 3/4" x 3/4" NPT Mal
Mat rials: – Body Brass
– S als EPDM
– Spring Stainl ss St l
– Knob ABS
M dium: Wat r and glycol solutions up to 50%
Maximum Working Pr ssur : 150 PSI (10 Bar)
Maximum Working T mp ratur : 230°F (110°C)
Maximum Flow Rat : 9 GPM
Adjustm nt Rang : 2 to 10 PSI (0.15 to 0.7 Bar)
INSTALLATION INSTRUCTIONS
INSTALLER: PLEASE LEAVE THIS MANUAL FOR THE OWNER’S USE.
DB-3/4"
Diff r ntial By-Pass Valv
3/4" x 3/4" NPT Mal Conn ctions
Op rational Limits
Bell & G ssett
Instruction Manual A91590
REVISION A
Max. T mp ratur 230°F (110°C)
Max. Pr ssur 150psig (10 Bar)
NOTE: This pr duct is n t intended f r use in p table
water applicati ns.
WARNING: Syst m fluids ar und r pr ssur or t mp-
ratur can b hazardous. B sur th pr ssur has
b n r duc d to z ro and th syst m t mp ratur is b low
100°F (38°C). Failur to follow th s instructions could r sult
in prop rty damag and/or p rsonal injury.
WARNING: State f Calif rnia Residents
This product contains a ch mical known by th Stat
of California to caus canc r. This products contains a
ch mical known by th Stat of California to caus birth
d f cts or oth r r productiv harm.
CAUTION: All work must b p rform d by qualifi d
p rsonn l train d in th prop r application, installation,
and maint nanc of syst ms in accordanc with all applica-
bl cod s and ordinanc s.
