Spirax Sarco DEP4 Cast Steel Relief Valve

Spirax Sarco Spirax Sarco DEP4 cast steel relief valves are cast steel body direct acting bellows sealed relief valves. The standard version has an EPDM diaphragm (max. operating temperature 125°C) and is suitable for water and steam systems. Nitrile rubber diaphragms (suffix "N", maximum operating temperature 90°C) are also available for oil systems. Note: In steam systems, a WS4 water seal tank must be used on the upstream pressure sensing tube to protect the actuator diaphragm, see TI-S12-03.

(an official) standard

The products are fully compliant with the European Pressure Equipment Directive 97 / 23 / EC, with marking on request.

Certification

As standard, products are supplied with manufacturer's typical test certificates. EN 10204 3.1 certificates are available on request. Note: The required certificates and test requirements need to be specified when placing the order.

Available Models

DN15-DN100 flange connection, 6 pressure ranges (suffix 1-6).

Upstream pressure range

realm	Valve Model	Actuator Model	Spring Color	DN15 - DN40 pressure range (bar)	DN50 - DN80 pressure range (bar)	DN100 pressure range (bar)	PN Rating
1	DEP4B1	11 or 11N	pornographic	0.1 - 0.5	0.1 - 0.3	0.1 - 0.3	2.5
2	DEP4B2	12 or 12N	pornographic	0.2 - 0.8	0.2 - 0.5	0.2 - 0.5	2.5
3	DEP4B3	13 or 13N	indigo plant	0.5 - 1.7	0.4 - 1.3	0.4 - 1.0	6
4	DEP4B4	14 or 14N	indigo plant	1.4 - 3.4	1.0 - 2.6	0.8 - 2.5	16
5	DEP4B5	15 or 15N	indigo plant	3.2 - 7.5	2.3 - 5.5	2.3 - 5.0	25
6	DEP4B6	15 or 15N	bonus	7.0 - 16.0	5.0 - 15.0	4.0 - 10.0	25

Sizes and pipe connections

DN15, DN20, DN25, DN32, DN40, DN50, DN65, DN80 and DN100 flanges: EN 1092 PN40. On request: JIS and ANSI 150, ANSI 300 flanges.

Pressure/Temperature Limits

ontology	PN40
PMA Maximum Allowable Pressure	40 bar g @ 50°C
TMA Maximum Allowable Temperature	300°C @ 25.8 bar g
Minimum design temperature	0°C
TMO EPDM Diaphragm Maximum Operating Temperature	125°C
Nitrile rubber diaphragm maximum working temperature	90°C
Minimum operating temperature (ambient)	0°C
PMX Maximum Working Differential Pressure	DN15 - DN50 25 bar; DN65 - DN100 20 bar
Design maximum cold hydraulic test pressure	60 bar g
classifier for sums of money	The test pressure should not exceed 40 bar g after installation of the internal components.

Kvs value

Caliber DN	15	20	25	32	40	50	65	80	100
Kvs	3.4	6.5	11.4	16.4	24	40	58	92	145

Note: The above KVS value is the value when the valve is fully open and is used for safety valve selection.

material (that sth is made of)

Item	Part	material (that sth is made of)
1	valve body	Cast steel GP 240 GH
2	bonnet	Cast steel DIN 17245 GSC25
3	Seat	Stainless steel BS 970 431 S29
4	Seat gasket	DN15: stainless steel; DN20 and DN25: mild steel; DN32 - DN50: reinforced flake graphite
5	spool	Stainless steel BS 970 431 S29
6	Spool Bolt	DN15 and DN20: stainless steel BS 6105 A2
7	Spool Seal	DN15 and DN20: Arlon 1555
8	bushing	Stainless steel BS 970 431 S29
11	Balanced Bellows Assembly Gasket	DN25 - DN100: Reinforced flake graphite
12	Cap Gasket	Reinforced flake graphite
13	Bonnet bolts	DN15 - DN40 M10: Steel DIN 267 Pt13 Gr. 8
14	DN50 and DN65 M12: steel DIN 267 Pt13 Gr. 8.8; DN80 and DN100 M16
15	mainstay	Galvanized steel BS 970 230 M07
16	Pillar Nuts	Galvanized steel BS 3693 Gr. 8
17	Spring Adjuster	Galvanized cast iron DIN 1691 GG25
18	sprung	chrome-vanadium steel
19	Bearing (part of component 20)	PTFE / steel composite
20	Sealed Bellows Assemblies	Stainless steel AISI 316L
21	Sealing Bellows Gasket	DN15 and DN20: stainless steel 'S' type; DN25 - DN100: reinforced flake graphite
22	fixing nut	DN25 - DN100: galvanized steel BS 970 230 M07
25	locknut	Galvanized steel BS 970 230 M07
26	spring-loaded stopper	Galvanized steel BS 1449 Pt 1 HR14
27	needle roller bearing	steel (chemistry)
28	Setting Nut	Galvanized steel BS 970 230 M07
29	Bearing Locator	Galvanized steel BS 970 230 M07
30	Regulator Sleeve	galvanized steel
31	Mounting Stalls	Types 11(N) - 14(N): Galvanized steel BS 1449 Pt 1 HR14 DIN 1514 St W24
32	housings	Type 15(N): Steel BS EN 10025 S355 J2G3
33	Housing bolts	Types 11(N) - 12(N): galvanized steel BS 3692 Gr. 5.6; Types 13(N), 14(N) and 15(N): galvanized steel BS 3692 Gr. 8.8
34	Housing Nut	Types 11(N) and 12(N): galvanized steel BS 3692 Gr. 5.6; Types 13(N), 14(N) and 15(N): galvanized steel BS 3692 Gr. 8
35	crown bar guide	Stainless steel BS 970 431 S29
36	diaphragm	EPDM or Nitrile Rubber
37	hexagonal screw	Stainless steel BS 6105 A2
38	sealing gasket	fibroid
39	diaphragm clamp	Stainless Steel ASTM A351 CF8M
40	pistons	Galvanized carbon steel BS 1449 Pt 1 HR14
41	top bar	Galvanized carbon steel BS 970 230 M07
42	mounting nut	Galvanized steel BS 3692 Gr. 8
43	pipe fitting	galvanized steel
44	Threaded Inserts	DN15 and DN20: stainless steel DTD 734; DN25 - DN100: galvanized steel BS 1449 CR4
45	Self-locking nuts	Galvanized steel BS 1449 CR4
46	spread litter in a cowshed, pigsty etc	Type 12(N) only: galvanized steel
47	spring ring	galvanized steel
48	Top Rod Seal 'O' Ring	EPDM or Nitrile Rubber
49	bear the weight of (a building)	PTFE/steel composite
50	Housing seal 'O' ring	EPDM or Nitrile Rubber
51	bleeder plug	plastics
52	coupling clip	Galvanized steel ASTM A216 Gr. WCB
53	sprung	Spring steel BS 5216 Gr. M4
54	set screw	Galvanized steel BS 4168 Gr. 12.9
55	retaining plate	DN65 to DN100 only: Stainless steel ASTM A276 316L
56	Sealing Gasket	Reinforced flake graphite

Sizing for Steam Applications

Use the selection table to determine the valve Kv for steam applications through; - upstream pressure - maximum valve pressure drop - maximum steam load. Knowing the valve Kv, the valve pressure drop at any given flow rate can be determined.

Selection of water applications

Use the selection table to determine the valve Kv for steam applications through; - Maximum flow rate - Maximum valve pressure drop. Knowing the valve Kv, the valve pressure drop at any given flow rate can be determined.

Spare Parts

Spare parts available (DN15 to DN20)

connection	A
Diaphragm assemblies (diaphragms and gaskets)	B, C
needle roller bearing	D
Sealed Bellows Assemblies	Seal bellows, bellows gasket, bonnet gasket: E, F, G, H
Control springs	I
Seat/spool assembly	Seats, seat gaskets, spool and bonnet gaskets: J, K, L, G, H
Gasket set	Sealing bellows gaskets, bonnet gaskets, and seat gaskets: F, G, K
Actuator rod guide set	Shaft guides, bearing bushings, shaft sealing 'O' rings, cavity sealing 'O' rings and retaining rings: P, R, S, T, V

Spare parts available (DN25 to DN100)

connection
Diaphragm assemblies (diaphragms and gaskets)
needle roller bearing
Sealed Bellows Assemblies
Control springs
DN25-DN50 seat/spool assemblies
DN65-DN100 spool assemblies
DN25-DN50 balanced bellows assembly
DN65-DN100 balanced bellows assembly
DN25-DN50 gasket set
DN65-DN100 gasket set
Actuator Bearing Assembly

Ordering Spare Parts Order spare parts according to the instructions above, specifying the valve size and model number. Example: 1-gasket set for DN 25 DEP4B1 relief valve.

mounting

Detailed installation instructions are provided in the installation and maintenance guide supplied with the spare part.

weights

Valve weight (kg)

Valve Caliber	DN15	DN20	DN25	DN32	DN40	DN50	DN65	DN80	DN100
Yellow spring weight	11.6	13.3	16.7	21.4	23.7	26.3	37.7	46.0	69.8
Blue Spring Weight	11.6	13.3	16.7	21.4	23.7	26.3	37.7	46.0	69.8
Red spring weight	13.6	14.8	18.2	22.9	25.2	27.8	39.4	47.7	72.5

Actuator weight (kg)

Actuator Model	1 or 1N	2 or 2N	3 or 3N	4 or 4N	5 or 5N
weights	12.3	6.5	4.0	2.6	2.7

Note: Total product weight equals the weight of the valve and actuator combined.

Security information, installation and maintenance

See the Installation and Maintenance Guide supplied with the product for detailed information. (IM-S12-10)

NOTE: When applied to steam systems, to protect the actuator diaphragm, a WS4 water seal tank should be installed upstream and connected to the actuator by a sensing tube. See TI-S12-03 for details.This valve should be installed vertically downstream in horizontal piping, ensuring that the direction of flow is as indicated by the arrow on the valve body. The valve can also be installed vertically upwards when the upstream temperature is below 125°C.

Order Installation

Example: 1 - Spirax Sarco DN40 DEP4B3 direct acting relief valve, Flanged, PN40. Note: Add suffix 'N' if Buna N diaphragm is required, also DEP4 B3N.