ARI-PREDEX®

Excess pressure regulator, straight through with diaphragm actuator

Description

eClass-No.:	37010990
Application:	Industrial installations, processing technology, plant manufacturing, etc.
Medium:	Steam, neutral gases, vapours and liquids, etc.

Features

• Compact design
• Construction without pillars
• Exact and easy adjustment
• Diameter independent ranges
• Simple change of spring and actuator
• 5 exchangeable actuator sizes
• 3 exchangeable spring sizes
• Pressure balanced by stainless steel bellow
• Spindle sealing via stainless steel bellow
• Tapered seat ring
• Screwed seat ring
• Kvs-values reduceable
• Flow divider for noise reduction (optional)
• Plug with PTFE soft sealing (optional)

Technical data

Excess pressure regulator, straight through with diaphragm actuator UDA

ARI-PREDEX® Excess pressure regulator, straight through with diaphragm actuator

Stainless steel – Actuator

Plug DN 15 – 32

Plug DN 40 – 150

Bellows seal DN 15 – 40

Figure	Nominal pressure	Material	Nominal diameter	Inlet pressure ranges	Actuator
12.705	PN16	EN-JL1040	DN15-150	0,2 – 16 barg	UDA 400 UDA 250 UDA 160 UDA 80 UDA 40
22.705	PN16	EN-JS1049	DN15-150
23.705	PN25	EN-JS1049	DN15-150
34.705	PN25	1.0619+N	DN15-150
35.705	PN40	1.0619+N	DN15-150
62.705	PN16	1.4581	DN15-150
65.705	PN40	1.4581	DN15-150
Technical data for the actuator refer to page 6.

100

125

150

Kvs-value
Kvs-value	standard	(m³/h)	3,2	5	8	12,5	20	32	50	80	125	190	280
Kvs-value	reduced	(m³/h)	0,1 / 0,4 / 1 / 2,5	0,1 / 0,4 / 1 / 2,5 / 4	0,1 / 0,4 / 1 / 2,5 / 4 / 6,3	—	—	—	—	—	—	—	—
Seat-ø		(mm)	18	22	25	32	40	50	65	80	100	125	150
Travel		(mm)	4	5	6	8	8	10	11	13	16	19	22
Max. differential pressure drop		(bar)	16	16	16	16	16	16	16	16	16	16	16
Shutt off class			Leakage class I acc. to DIN EN 1349 or DIN EN 60534-4 ( ≤ 0,05% from Kvs-value)

Face-to-face dimension FTF series 1 according to DIN EN 558
L	(mm)	130	150	160	180	200	230	290	310	350	400	480

Flanges acc. to DIN EN 1092-1/-2 Flange holes / -thickness tolerances acc. to DIN 2533/2544/2545
ØD	PN16	(mm)	95	105	115	140	150	165	185	200	220	250	285
ØD	PN25 / 40	(mm)	95	105	115	140	150	165	185	200	235	270	300
ØK	PN16	(mm)	65	75	85	100	110	125	145	160	180	210	240
ØK	PN25 / 40	(mm)	65	75	85	100	110	125	145	160	190	220	250
n x Ød	PN16	(mm)	4 x 14	4 x 14	4 x 14	4 x 18	4 x 18	4 x 18	4 x 18	8 x 18	8 x 18	8 x 18	8 x 22
n x Ød	PN25 / 40	(mm)	4 x 14	4 x 14	4 x 14	4 x 18	4 x 18	4 x 18	8 x 18	8 x 18	8 x 22	8 x 26	8 x 26

Dimensions
H	UDA 400	(mm)	545	545	550	550	590	590	595	635	660	700	740
	UDA 250	(mm)	505	505	510	510	550	550	555	595	635	660	700
	UDA 160	(mm)	485	485	490	490	530	530	535	580	600	640	680
	UDA 80	(mm)	485	485	490	490	530	530	535	580	600	640	680
	UDA 40	(mm)	485	485	490	490	530	530	535	580	600	640	680

Weights
12.705 / 22./23.705 / 34./35.705 62./65.705	with UDA 400	(kg)	28	29	30	32	37	43	50	73	91	131	164
	with UDA 250	(kg)	23	24	25	27	32	38	45	68	88	129	162
	with UDA 160	(kg)	21	22	23	25	30	36	43	66	86	127	160
	with UDA 80	(kg)	20	21	22	24	29	35	42	65	85	126	159
	with UDA 40	(kg)	19	20	21	23	28	34	41	64	84	125	158

Inlet pressure-ranges
	(barg)	0,2 – 0,6	0,5 – 1,2	0,8 – 2,5	2 – 5	4,5 – 10	8 – 16
P-Actuator UDA	(cm²)	UDA 400	UDA 250	UDA 160	UDA 80	UDA 40
PN-max. (P-Actuator)	(barg)	1,6	2,5	6	10	20
Spring end-No.		04	04	07	07	07	10

100

125

150

Proportional ranges (Combination: actuator with valve in ± bar)
	UDA 400	0,2 – 0,6	0,05	0,05	0,05	0,06	0,08	0,10	0,12	0,14	0,17	0,18	0,23
	UDA 250	0,5 – 1,2	0,06	0,07	0,09	0,11	0,12	0,15	0,16	0,20	0,25	0,25	0,45
	UDA 160	0,8 – 2,5	0,15	0,20	0,25	0,35	0,35	0,40	0,55	0,50	0,65	0,65	0,85
	UDA 80	2,0 – 5,0	0,30	0,30	0,45	0,55	0,50	0,65	0,75	0,85	1,05	1,50	1,65
	UDA 40	4,5 – 10,0	0,35	0,50	0,70	0,75	0,80	1,05	1,25	1,60	1,70	2,25	2,50
	UDA 40	8,0 – 16,0	0,50	0,65	1,05	1,15	1,20	1,50	1,60	1,80	1,90	3,30	3,50
Excess pressure regulators are proportional regulators with permanent control deviation depending from the construction. The actual control deviation depends on the valve load. (Kv-value / Kvs-value-max) x Proportional range = Actual control deviation The values shown are preliminary values and may vary by the real plant.
Intermediate values for max. permissible operational pressures can be determined by linear Pressure-temperature-ratings interpolation of the given temperature / pressure chart.

acc. to DIN EN 1092-2			-60°C to <-10°C*	-10°C to 120°C	150°C	200°C	250°C	300°C	350°C
EN-JL1040	PN16	(bar)	—	16	14,4	12,8	11,2	9,6	—
EN-JS1049	PN16	(bar)	on request	16	15,5	14,7	13,9	12,8	11,2
EN-JS1049	PN25	(bar)	on request	25	24,3	23	21,8	20	17,5

acc. to manufacturers standard			-60°C to <-10°C*	-10°C to 120°C	150°C	200°C	250°C	300°C	350°C
1.0619+N	PN25	(bar)	18,7	25	23,9	22	20	17,2	16
1.0619+N	PN40	(bar)	30	40	38,1	35	32	28	25,7

acc. to DIN EN 1092-1			-60°C to <-10°C*	-10°C to 120°C	150°C	200°C	250°C	300°C	350°C
1.4581	PN16	(bar)	8	16	15,6	14,9	14,1	13,3	12,8
1.4581	PN40	(bar)	20	40	39,2	37,3	35,4	33,3	32,1

* Studs and nuts made of A4-70 (at temperatures below -10°C)

Application

The excess pressure regulator is a self operated, direct acting proportional regulator, which regulates the upstream pressure.

The upstream pressure (p1) is regulated, this means, the valve opens when the upstream pressure rises over an adjusted set point. If the upstream pressure decreases under the adjusted set point, the valve closes automatically. Because of the stainless steel bellows, the downstream pressure (p2) has no influence.

Operating fields are to regulate fluids of the group II acc. to Pressure Equipment Directive 2014/68/EU, e.g. steam, neutral gases, vapours and liquids. With steam and liquids, having temperatures higher than the allowable working temperatures a water seal pot must be installed in the control line (to protect actuator diaphragm) (refer to page 6).

Installation in the control line can be seen in the system drawing:

ARI-PREDEX® Excess pressure regulator, straight through with diaphragm actuator

Sizing
For the calculation you have the program myValve (Program part PREDEX – Excess pressure regulator). After giving in the process data, the Fig.-No. and size is recommended
out of the integrated data bank. The diameter of the piping in front and behind of the Excess pressure regulator can also be calculated with the max. allowable flow velocities
with myValve.
The necessary upstream pressure gives the needed pressure range. Because the regulation tolerance at the end of the range is smaller, the smaller range must be used, in
case of a range overlapping. For example: upstream pressure 2,4 bar(g), choose actuator range 0,8 – 2,5 bar(g), although 2-5 bar(g) could be used.
The safety valve used to secure the upstream pressure must have an adequate distance between set pressure and upstream pressure. The valve sizing must be done with the
full capacity of the supplying generator (steam generator, compressor, pump, etc.) while the excess pressure regulator is closed. With this found capacity you can, with myValve
(Program part: Safety valves), select the safety valve, and with the exess pressure regulator and other valves, administer them under a project.