Product Overview

ManualsBrandsCaleffi ManualsDifferential Bypass Valves3/4" Union Sweat Differential Bypass Valve

CALEFFI

ACCREDITED

ISO 9001 No. 0003

ISO 9001 FM 21654

519709A

519566A

Differential pressure by-pass valve

519 series

01007/14 NA

Function

The differential pressure by-pass valve is used in systems with a ﬁxed

speed circulating pump supplying several zones controlled by two way

zone valves. This valve ensures that the head pressure of the pump

is proportional to the number of two way valves being closed. It will

by-pass the differential pressure created by the pump as the zone valves

close, thus eliminating water hammer noise.

The 519 series is available with conventional NPT and sweat union

connections. Also available for size 3/4”, the Presscon™ copper tail-

piece with union nut makes installation and maintenance fast, easy and

efficient. Special slots in the EPDM O-ring allows fluid to leak during

system testing if unpressed and provide a perfect leak proof seal when

completely pressed.

Product range

Code 519502A Adjustable differential pressure by-pass valve

with graduated scale, ﬂow up to 9 gpm .............................................. connections 3/4" MNPT union inlet x 3/4" MNPT union outlet

Code 519566A Adjustable differential pressure by-pass valve

with graduated scale, ﬂow up to 9 gpm .................................................connections 3/4" press union inlet x 3/4" press union outlet

Code 519599A Adjustable differential pressure by-pass valve

with graduated scale, ﬂow up to 9 gpm ................................................connections 3/4" sweat union inlet x 3/4" sweat union outlet

Code 519600A Adjustable differential pressure by-pass valve

with graduated scale, ﬂow up to 40 gpm .............................................................. connections 1" FNPT inlet x 1" MNPT union outlet

Code 519609A Adjustable differential pressure by-pass valve

with graduated scale, ﬂow up to 40 gpm ...................................................................... connections 1" FNPT x 1" sweat union outlet

Code 519700A Adjustable differential pressure by-pass valve

with graduated scale, ﬂow up to 45 gpm ..................................................connections 1-1/4" FNPT inlet x 1-1/4" MNPT union outlet

Code 519709A Adjustable differential pressure by-pass valve

with graduated scale, ﬂow up to 45 gpm .................................................. connections 1-1/4" FNPT inlet x 1-1/4" sweat union outlet

Technical specification

Materials - body: brass

- valve plug: brass

- valve plug gasket: EPDM

- O-Ring seals: EPDM

- union seals: asbestos free NBR

- control knob: ABS

- spring: stainless steel

Performance

Suitable ﬂuids: water, glycol solutions

Max. percentage of glycol: 30%

Temperature range: 32 to 230°F (0 to110°C)

Max. working pressure: 150 psi (10 bar)

Flow rates: 3/4" ﬂow up to 9 gpm

1" ﬂow up to 40 gpm

1-1/4" ﬂow up to 45 gpm

Setting range: 1 to 6 m w.g. (2 to 10 psi)

Replaces 01007/12 NA

Summary of content (5 pages)

PAGE 1
Differential pressure by-pass valve CALEFFI 519 series 01007/14 NA ACCREDITED ISO 9001 FM 21654 ISO 9001 No. 0003 Replaces 01007/12 NA Function The differential pressure by-pass valve is used in systems with a fixed speed circulating pump supplying several zones controlled by two way zone valves. This valve ensures that the head pressure of the pump is proportional to the number of two way valves being closed.
PAGE 2
Dimensions mH2O 1 2 1 3 2 3 4 4 5 5mH2O 6 6 mH2O 519609A 519609A 1 2 1 3 2 4 3 5 4 5 mH2O 6 6 mH2O A ⁄4" MNPT 3 519566A 3 519599A 3 AA CC B D B D AA CC B C D E Wt. (lb.
PAGE 3
Hydraulic characteristics 9 8 7 6 6 5 4 2 7 10 9 8 7 4 4 3 2 1 4 6 5 4 1 2 3 4 5 mH2O 6 3 2 3 40 1 0 3 9 35 8 7 6 5 4 3 2 30 0 25 0 20 0 15 1 10 1 3 2 4 3 2 2 1 G (m /h) (gpm ) 9 8 1 2 3 4 5 mH2O 6 G (m /h) (gpm ) 3 4 7 6 3 5 6 5 5 1.5 5 4 G (m /h) (gpm ) 6 Differential pressure by-pass valves are connected between the supply and return headers of a zoned system.
PAGE 4
Shut-off valve Pump RT Application diagrams Small-medium size system by-pass in mechanical room.
PAGE 5
SPECIFICATION SUMMARIES 519 series Differential pressure by-pass valve. Union connections: 3/4" MNPT union inlet x 3/4" MNPT union outlet, 3/4" union press inlet x 3/4" union press outlet, 3/4" sweat union inlet x 3/4" sweat union outlet, 1" FNPT inlet x 1" MNPT union outlet, 1" FNPT inlet x 1" sweat union outlet, 1-1/4" FNPT inlet x 1-1/4" MNPT union outlet and 1-1/4" FNPT inlet x 1-1/4" sweat union outlet. Brass body. Brass valve plug. EPDM valve plug gasket. EPDM O-Ring seals.