DA 516 Submittal F315 - Flow Design Inc.

F L O W D E S I G N I N C
DA 516
Adjustable Differential Pressure Controller
Form No.: F315.0
Date: 1.08
Supersedes:
1/2" - 2" (Threaded Connections) 2 1/2" - 5" (Flanged Connections)
Product Information
Max. working pressure: 363 psi /25 bar
Max. differential pressure: 232 psi /16 bar
Min. / max. temperature: 14° F / 284° F
Setting range:
∆p over the load is adjustable
within 1 - 15 psi
Housing: Ductile Iron GGG 40.3
Diaphragms and seals: EPDM
Adjustment ring: Ryton plastic - 1/2" - 2"
R St 37-2 steel - 2 1/2" - 5"
Surface treatment: Electrophoretic painting
Markings:
FDI, PN, GGG 40.3, Cv, ∆p
and flow direction arrow
Flanges:
2 1/2" - 5" – flanged according to
ANSI Class 150
Model DA 516 stabilizes the differential pressure between the
location where it is installed, and an upstream location where the
capillary pipe is connected. In this way, the branch to which it is
connected will not be influenced by pressure fluctuations in the
rest of the system. The DA has an adjustment ring which allows
the user the flexibility to set the required differential pressure in
the given range (1-15 psi). Because it absorbs excess pressure, it
makes control valves work more quietly and reliably. Depending
on the flow rates and piping layout, the DA can stabilize multiple
independent circuits within a branch. Because it provides a selfadjusting
pressure stabilization, DA is well-suited in piping
systems with big change in pressure, even with variable speed
pumps. The adjustable differential pressure controller DA516 can
be used to maintain constant differential pressure in heating and
cooling systems with variable flow.
1/2” - 2” Threaded
1/2" - 2" (Threaded Connections) 2 1/2" 2 1/2” - 5" -(Flanged 5” Flanged Connections)
Dimensions not to be used for construction unless prints certified by factory.
Dimensions
Size Model d ØD L L1* Cv Q max Weight
threads in in in gpm lb
1/2" DA516_1/2
G1 3.1 4.2 4.6 4.7 8 3.1
3/4" DA516_3/4 G1 3.1 4.2 4.6 4.7 8 3.1
1" DA516_1
G 1 1/4 3.9 4.9 5.9 14.0 24 5.3
1 1/4" DA516_1 1/4 G 1 1/4 3.9 4.9 5.9 14.0 24 5.3
1 1/2" DA516_1 1/2
G2 5.1 6.4 7.5 34.9 60 9.7
2" DA516_2 G2 5.1 6.4 7.5 34.9 60 9.7
2 1/2" DA516_2 1/2
3" DA516_3
– 8.3 6.3 6.3 69.8 121 40.8
Notes:
4" DA516_4
5" DA516_5
– 12.6 10.0 10.0 174.4 302 125.7
Capillary pipe included: 1/4" x 50"
→ = Flow Direction
*) Length including adjustment ring.
d
L, L1
Connections
Size Model Union Threads 1/2" 3/4" 1" 1 1/4" 1 1/2" 2"
1/2" DA516_1/2
G 1 F,M,S F,M,S
3/4" DA516_3/4
1" DA516_1
1 1/4" DA516_1 1/4
1 1/2" DA516_1 1/2
2" DA516_2
d
ØD
G 1 1/4
G 2
L, L1
F,M,S F,M,S F,M,S F,M,S
ØD
F,M,S F,M,S F,M,S F,M,S
Note: Size 2 1/2" - 5" are flanged and do not need any separate connections.
F = Female NPT, M = Male NPT, S = Sweat
Flow Design Inc. / 8908 Governors Row / Dallas, Texas 75247
1-800-ASK-FLOW / +1 214 631 0011
www.flowdesign.com
A division of IMI Indoor Climate

F L O W D E S I G N I N C
Operating Function
Operating Function
The pressure before the load (object across which you want to stabilize pressure) acts
through an external capillary pipe (∆p+) on the plus side of the diaphragm (1) and
attempts to close the valve.
The pressure after the load acts via an internal capillary pipe in the valve body and
attempts, together with the spring (3) force, to open the valve. In this way, the
differential pressure over the load is kept constant on the set value.
The spring force can be adjusted by turning the adjustment ring (5). Adjustment can be
fixed by tightening the fixing screw (4).
(1) Diaphragm (2) Venting Screws (3) Spring
(4) Fixing Screw (5) Adjustment Ring
∆p+
1 2 3 4 5
∆p-
R1/4
Installation
Note! DA 516 valve closes at increasing
differential pressure. Therefore, it is not
recommended to install the DA 516 valves in the
bypass line of constant flow systems. It is not
allowed to disassemble the valve body. By
incorrect handling, the controller may not
∆p+
work properly and safety problems may
occur.
Turn the adjustment ring (5) clock-wise until
stop and the nut (7) on the outlet side will
be accessible.
The DA 516 must be installed downstream of
the load for which the pressure is being
controlled. Flow direction is shown by arrow (11)
on the valve's identification plate (10). The best
position is horizontal with the venting screws (2)
pointing upwards. Installation of a strainer (Flow
Design model YC) is recommended upstream of the
valve. Connect capillary pipe (∆p+), to the pipeline
upstream of the load. In case of a horizontal pipeline
connect the capillary pipe laterally to prevent air and
dirt from entering. When filling, vent the body by using
the venting screws (2). When soldering the valve must
be protected from too high temperature. This typically
means that soldering should be carried out by
slipping union nut and tail piece onto the pipe
separate from the valve, soldering the tailpiece in
place, and installing the valve with its gaskets
between the tailpieces after they have cooled.
Capillary pipe
Before taking into operation, the capillary pipe must
be installed. One end of the capillary pipe goes into
the DA 516 and the other end of the capillary pipe is
connected to the strainer YC (through the provided
1/4" NPT fitting connection).
11
10
Figure 3 b: Two Water 7
9 8 Loops with TBV-Cs, DA 516 and YC
YC
DA 516
2
Figure 3
UB
∆p+
∆p+
5
DA 516
DA 516
YC
M
M
UP
Figure 1
Figure 2
TBV-C

DA 516
Adjustable Differential Presssure Controller
Setting
The differential pressure can be adjusted by turning the adjustment ring. For 2" and smaller valves, the adjustment ring has a marking
for ∆p for each turn. The preset value can be secured by attaching a wire through the holes.
Pressure Adjustment
Differential pressure adjustment for DA 516, ½” to 2”
1. Unscrew the fixing screw (4) with a 2mm Allen key on the setting wheel (1).
2. Turn the setting wheel clockwise to increase the differential pressure and
vice versa.
3. On the setting wheel, there is a mark which shows how the ∆p changes at one
turn of the setting wheel.
4. The pressure can also be measured through pressure gauges on the pipeline
and adjusted through the setting wheel.
5. After the required differential pressure ∆p is reached, tighten the fixing screw
on the setting wheel.
6. It is also possible to secure the setting with the leaden seal by using the holes
on the body and the setting wheel (1).
1
4
∆p
∆p
Differential pressure adjustment for DA 516, 2 ½” and above
1. The principle of adjustment for the DA 516, size 2 1/2” and above is the same
as size 2“ and below, except there is no mark which shows how the ∆p
changes at one turn of the setting wheel. Also there is no fixing screw and no
leaden seal.
∆p =min
2. The setting wheel (10) moves indirectly by the middle nut (11), which can be
turned by the tool provided with the DA 516 in the package.
∆p
3. The pressure can be set by reading the pressure gauges on the pipeline and
adjusting the middle nut according to the requirements.
11 10

DA 516
Adjustable Differential Presssure Controller
F L O W D E S I G N I N C
Sizing
1. Select the smallest size for the designed flow according to the diagram.
2. Check that the available ∆p is bigger than the pressure drop of the DA 516 at the designed flow.
The pressure drop can be found in the diagram or calculated by the formula:
Differential Pressure (psi)
3
2
Size Size Size Size Size
1/2” / 3/4” 1” / 1 1/4” 1 1/2” / 2” 2 1/2” / 3” 4” / 5”
1
0.5
0.25
0.2
1.5 2
4 8 16 32 64 128 256 350
Q (gpm)
8908 Governors Row / Dallas, Texas 75247
1-800-ASK-FLOW / +1 214 631 0011
www.flowdesign.com