Features & Benefits
Inline design
Inline flow allows high pressure drops without noise.
Adjustable set-point
Delivers desired differential pressure ensuring accurate balancing.
Technical Information
Application:
Heating and cooling systems.
Installation in supply pipe.
Functions:
Differential pressure control
Pre-setting Δp over the load (ΔpL)
Dimensions:
1/2" - 5"
Pressure class:
1/2"-2": PN 25 (362 psi)
2 1/2"-5": Class 150
Max. differential pressure (ΔpV):
230 psi
Setting range:
Δp over the load is adjustable within:
0.73-4.35 psi, 1.45-8.7 psi, 1.45-14.5 psi, 8.7-22 psi.
Delivery setting:
Size 1/2"-2": Maximum value (4.35, 8.7, 14.5, 22 psi).
Size 2 1/2"-5": Midway min./max. value (~2.61, ~1.02, ~1.45, ~15.2 psi).
Temperature:
Max. working temperature: 302°F
Min. working temperature: 14°F
Media:
Water or neutral fluids, water-glycol mixtures (0-57%).
Material:
Valve body: Ductile iron EN-GJS-400-15
Diaphragms and gaskets: EPDM
Adjustment ring: Size 1/2"-2" Ryton PPS, size 2 1/2"-5" R St 37-2 steel.
Surface treatment:
Electrophoretic painting.
Marking:
IMI TA, DN, PN, Material, Kvs, Δp and flow direction arrow.
Connection:
Size 1/2" - 2": Male threads according to ISO 228. (Separate connections with ANSI flanges and NPT threads.)
Size 2 1/2" - 5": Flanges according to ASME/ANSI B16.42 Class 150.
Articles
Size 1/2"-2"
Male thread – Separate connections with NPT threads or ANSI flanges – see Connections for size 1/2"-2".
Male threads according to ISO 228.
Included: Capillary pipe (Ø6 mm) 2 x 4 ft, connection set (G1/2+G3/4) for capillary pipe to e.g. STAD and 2 capillary pipe connections R1/4 (R1/8 mounted on valve).

Size | d | L | L1* | H1 | H2 | Cvs | lb. | EAN | Article No | |
1-4 psi | ||||||||||
1/2" / 3/4" | G1 | 4,2 | 4,6 | 1,6 | 3,1 | 4,6 | 3,3 | 3831112505476 | 52 763-120 | |
1" / 1 1/4" | G1 1/4 | 4,9 | 5,9 | 2,0 | 3,3 | 13,9 | 5,7 | 3831112503953 | 52 763-125 | |
1 1/2" / 2" | G2 | 6,4 | 7,5 | 2,8 | 4,0 | 34,7 | 12,8 | 3831112504042 | 52 763-140 | |
4-9 psi | ||||||||||
1/2" / 3/4" | G1 | 4,2 | 4,6 | 1,6 | 3,1 | 4,6 | 3,3 | 3831112505377 | 52 761-120 | |
1" / 1 1/4" | G1 1/4 | 4,9 | 5,9 | 2,0 | 3,3 | 13,9 | 5,7 | 3831112504134 | 52 761-125 | |
1 1/2" / 2" | G2 | 6,4 | 7,5 | 2,8 | 4,0 | 34,7 | 12,8 | 3831112504196 | 52 761-140 | |
4-15 psi | ||||||||||
1/2" / 3/4" | G1 | 4,2 | 4,6 | 1,6 | 3,1 | 4,6 | 3,3 | 3831112504189 | 52 760-120 | |
1" / 1 1/4" | G1 1/4 | 4,9 | 5,9 | 2,0 | 3,3 | 13,9 | 5,7 | 3831112504004 | 52 760-125 | |
1 1/2" / 2" | G2 | 6,4 | 7,5 | 2,8 | 4,0 | 34,7 | 12,8 | 3831112504103 | 52 760-140 | |
9-21 psi | ||||||||||
1/2" / 3/4" | G1 | 4,2 | 4,6 | 1,6 | 3,1 | 4,6 | 3,3 | 3831112504233 | 52 762-120 | |
1" / 1 1/4" | G1 1/4 | 4,9 | 5,9 | 2,0 | 3,3 | 13,9 | 5,7 | 3831112504141 | 52 762-125 | |
1 1/2" / 2" | G2 | 6,4 | 7,5 | 2,8 | 4,0 | 34,7 | 12,8 | 3831112504158 | 52 762-140 |
*) Length incl adjustment ring.
2 1/2" - 5"
Flanges – Do not need any separate connections.
Flanges according to ASME/ANSI B16.42 Class 150.
Included: Capillary pipe (Ø6 mm) 2 x 5 ft. and 2 capillary pipe connections R1/4 (M14x1 mounted on valve).

Size | D | L | Cvs | lb. | EAN | Article No | |
1-4 psi | |||||||
2 1/2" | 8,3 | 6,3 | 69,4 | 39,7 | 3831112529885 | 52 768-665 | |
3" | 8,3 | 6,3 | 69,4 | 39,7 | 3831112529922 | 52 768-680 | |
4" | 12,6 | 10 | 173,4 | 127,9 | 3831112529809 | 52 768-690 | |
5" | 12,6 | 10 | 173,4 | 127,9 | 3831112529847 | 52 768-691 | |
4-9 psi | |||||||
2 1/2" | 8,3 | 6,3 | 69,4 | 39,7 | 3831112529878 | 52 768-765 | |
3" | 8,3 | 6,3 | 69,4 | 39,7 | 3831112529915 | 52 768-780 | |
4" | 12,6 | 10 | 173,4 | 127,9 | 3831112529793 | 52 768-790 | |
5" | 12,6 | 10 | 173,4 | 127,9 | 3831112529830 | 52 768-791 | |
4-15 psi | |||||||
2 1/2" | 8,3 | 6,3 | 69,4 | 39,7 | 3831112529861 | 52 768-865 | |
3" | 8,3 | 6,3 | 69,4 | 39,7 | 3831112529908 | 52 768-880 | |
4" | 12,6 | 10 | 173,4 | 127,9 | 3831112529786 | 52 768-890 | |
5" | 12,6 | 10 | 173,4 | 127,9 | 3831112529823 | 52 768-891 | |
9-21 psi | |||||||
2 1/2" | 8,3 | 6,3 | 69,4 | 39,7 | 3831112529892 | 52 768-965 | |
3" | 8,3 | 6,3 | 69,4 | 39,7 | 3831112529939 | 52 768-980 | |
4" | 12,6 | 10 | 173,4 | 127,9 | 3831112529816 | 52 768-990 | |
5" | 12,6 | 10 | 173,4 | 127,9 | 3831112529854 | 52 768-991 |
Cvs = gpm at a pressure drop of 1 psi and fully open valve.
→ = Flow direction
Attention! Must be used on the outlet side.
With ANSI flange (extended)
Attention! Must be used on the outlet side.
According to ASME/ANSI B 16.42 Class 150.

d1 | d2 | D [in] | L1* [in] | EAN | Article No |
G1 | 1/2"-13 UNC | 3.50 | 1.85 | 3831112511828 | 52 759-915 |
G1 | 1/2"-13 UNC | 3.88 | 1.85 | 3831112511842 | 52 759-920 |
G1 1/4 | 1/2"-13 UNC | 4.25 | 2.44 | 3831112511859 | 52 759-925 |
G1 1/4 | 1/2"-13 UNC | 4.62 | 2.44 | 3831112511880 | 52 759-932 |
G2 | 1/2"-13 UNC | 5.00 | 2.83 | 3831112511903 | 52 759-940 |
G2 | 5/8"-11 UNC | 6.00 | 2.83 | 3831112511507 | 52 759-950 |
*) Fitting length (from the gasket surface to the end of the connection).
Attention! Can be used on the inlet side only.
With ANSI flange
Attention! Can be used on the inlet side only.
According to ASME/ANSI B 16.42 Class 150.

d1 | d2 | D [in] | L1* [in] | EAN | Article No |
G1 | 1/2"-13 UNC | 3.50 | 0.394 | 3831112511811 | 52 759-815 |
G1 | 1/2"-13 UNC | 3.88 | 0.787 | 3831112511835 | 52 759-820 |
G1 1/4 | 1/2"-13 UNC | 4.25 | 0.197 | 3831112511866 | 52 759-825 |
G1 1/4 | 1/2"-13 UNC | 4.62 | 0.591 | 3831112511873 | 52 759-832 |
G2 | 1/2"-13 UNC | 5.00 | 0.197 | 3831112511897 | 52 759-840 |
G2 | 5/8"-11 UNC | 6.00 | 0.787 | 3831112511491 | 52 759-850 |
Threads according to ANSI/ASME B1.20.1-1983.Swivelling nut
With female thread NPT
Threads according to ANSI/ASME B1.20.1-1983.
Swivelling nut

d1 | d2 | L1* [in] | EAN | Article No |
G1 1/4 | 1 NPT | 2.87 | 3831112533394 | 52 751-307 |
G1 1/4 | 1 1/4 NPT | 3.15 | 3831112533400 | 52 751-308 |
G2 | 1 1/2 NPT | 3.23 | 3831112533417 | 52 751-309 |
G2 | 2 NPT | 3.66 | 3831112533424 | 52 751-310 |
Suitable when insulation is used.Stainless steel/EPDM/Brass.
Venting extension
Suitable when insulation is used.
Stainless steel/EPDM/Brass.

d | D [in] | L [in] | EAN | Article No |
M6 | 0.47 | 2.76 | 3831112531727 | 52 759-220 |
Capillary pipe
Ø6 mm
2 pcs included in DAF 516.

L [ft] | Ø | Valve size | EAN | Article No |
4 | 6 mm | 1/2" - 2" | 3831112527157 | 52 759-215 |
5 | 6 mm | 2 1/2" - 5" | 3831112527164 | 52 759-265 |
Brass/EPDM
Venting screw
Brass/EPDM

d | EAN | Article No |
M6 | 3831112527980 | 52 759-211 |
For capillary pipe Ø6 mm with R1/4, R1/8 and M14 connection.
Capillary pipe connection
For capillary pipe Ø6 mm with R1/4, R1/8 and M14 connection.
1/2” - 2”: 2 pcs R1/4 included in DAF 516 (2 pcs R1/8 mounted on valve).
2 1/2” - 5”: 2 pcs R1/4 included in DAF 516 (2 pcs M14x1 mounted on valve).

Valve size | EAN | Article No | |
6 mm x R1/4 | 2 1/2" - 5" | 3831112527355 | 52 759-201 |
6 mm x R1/8 | 1/2" - 1 1/4" | 3831112533868 | 52 759-213 |
6 mm x R1/8 | 1 1/2" - 2" | 3831112533875 | 52 759-218 |
6 mm x M14x1 | 2 1/2" - 5" | 3831112535145 | 52 759-214 |
Must be used on STAD when connection of Ø6 mm capillary pipe.
Connection set STAD
Must be used on STAD when connection of Ø6 mm capillary pipe.
2 transition nipples (G1/2 and G3/4), 1 thrust nut (Ø6), 1 cone (Ø6) and 1 support bush are included in DAF 516, DN 15-50 (sizes 1/2" - 2").

d | EAN | Article No |
G1/2 | 7318793850003 | 52 762-006 |
G3/4 | 7318793850102 | 52 762-106 |
Capillary pipe connection with shut-off
For connection of Ø6 mm capillary pipe to STAF/STAF-SG.

d | D | Valve size | EAN | Article No |
G1/4 | 6 mm | 3/4" - 2" | 7318793999504 | 52 265-209 |
G3/8 | 6 mm | 2 1/2" - 16" | 7318793999405 | 52 265-208 |
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