The Spirax Sarco DCV41 is an austenitic stainless steel disc check valve available with either screwed or socket weld end connections. Its function is to prevent reverse flow on a wide variety of fluids for applications in process lines, hot water systems, steam, and condensate systems. For oil and gas applications, a Viton seat is available. For water applications, an EPDM seat is available.

Soft seat versions provide a zero leakage rate or bubble-tight shut-off, meeting EN 12266-1 Rate A, providing a differential pressure exists. The shut-off of the standard valve conforms to EN 12266-1 Rate E. When a heavy-duty spring is installed with an EPDM seat, the valve is suitable for boiler feedwater check applications. A high-temperature spring version is available to operate at 400 °C (752 °F).

DCV41 Food+ Version

Designed, manufactured, and approved for Steam and Condensate applications, the DCV41 metal seat and EPDM seat range Food+ product complies with (EC)1935:2004, (EC)2023:2006, (EU)10/2011, and FDA CFR Title 21. It is intended to be connected into a system that can operate a food contact compliant process.

Optional Extras

• Heavy duty springs: 700 mbar (10.2 psi) opening pressure for boiler feed applications.
• High temperature springs: For operation up to 400 °C.
• Viton soft seats: For oil and gas applications (screwed connections only).
• EPDM soft seats: For water applications (screwed connections only).

Sizes and Pipe Connections

½", ¾", 1", 1¼", 1½", and 2"

• Screwed BSP T Rp (ISO 7-1) to BS 21 female parallel
• Screwed NPT to ASME B 1.20.1
• Socket weld to ASME B 16.11 Class 3000 (Note: soft seat options are not available with socket weld ends).

Materials

No.	Part	Material	Standard
1	Body	Austenitic stainless steel	ASTM A351 CF3M
2	Seat	Austenitic stainless steel	ASTM A351 CF3M
3	Disc	Austenitic stainless steel	ASTM A276 316
4	Standard / Heavy duty spring	Austenitic stainless steel	BS 2056 316 S42
4	High temperature spring	Nickel alloy	Nimonic 90

Pressure / Temperature Limits

Condition	Value
Body design conditions	PN50
PMA - Maximum allowable pressure	49.6 bar g @ 38 °C (719 psi g @ 100 °F)
TMA - Maximum allowable temperature	400 °C @ 29.4 bar g (752 °F @ 426 psi g)
Minimum allowable temperature	-29 °C (-20.2 °F)
PMO - Maximum operating pressure	49.6 bar g @ 38 °C (719 psi g @ 100 °F)
TMO - Max operating temp (Metal seat / High temp spring / No spring)	400 °C (752 °F)
TMO - Max operating temp (Metal seat & standard spring)	300 °C (572 °F)
TMO - Max operating temp (Viton seat)	205 °C (401 °F)
TMO - Max operating temp (EPDM seat)	120 °C (248 °F)
Minimum operating temperature (Metal seat)	-29 °C (-20 °F)
Minimum operating temperature (Viton seat)	-25 °C to +205 °C
Minimum operating temperature (EPDM seat)	-40 °C to +120 °C
Maximum cold hydraulic test pressure	76 bar g (1102 psi g)

Product is safe for use under full vacuum conditions.

Dimensions and Weights

Size	A (Socket weld)	A (Screwed)	B (A/F)	Weight
½"	50 mm (1.97")	51 mm (2.01")	34 mm (1.34")	0.2 kg (0.44 lb)
¾"	55 mm (2.17")	57 mm (2.24")	41 mm (1.61")	0.3 kg (0.66 lb)
1"	67 mm (2.64")	68 mm (2.68")	50 mm (1.97")	0.5 kg (1.1 lb)
1¼" to 2"	100 mm (3.94")	100 mm (3.94")	80 mm (3.15")	2.0 kg (4.4 lb)

Kv Values

Size	½"	¾"	1"	1¼"	1½"	2"
Kv	4.4	7.5	12	30	35	35

Opening Pressures

Differential pressures with zero flow for standard and high temperature springs (mbar).

Flow Direction	½"	¾"	1"	1¼" to 2"
↑ (Up)	25	25	25	25
→ (Horizontal)	22.5	22.5	22.5	22.5
↓ (Down)	20	20	20	20

Without spring (vertical bottom-to-top flow only):

Flow Direction	½"	¾"	1"	1¼" to 2"
↑ (Up)	3.0	2.5	4.0	6.5

Heavy duty springs have an opening pressure of approximately 700 mbar.

Pressure Loss Diagram

Pressure loss diagram with open valve at 20 °C (68 °F). The values indicated are applicable to spring-loaded valves with horizontal flow. With vertical flow, insignificant deviations occur only within the range of partial opening.

Installation and Safety

The DCV41 disc check valve must be fitted in accordance with the direction of flow arrow indicating correct fluid flow direction. When fitted with a spring, they can be installed in any plane.

Installation without spring

When supplied without a spring, the valve must be fitted in a vertical flow line with the flow from bottom-to-top.

Viton Seat Hazard

If a product which contains a Viton component has been subjected to a temperature approaching 315 °C (599 °F) or higher, it may have decomposed and formed hydrofluoric acid. Avoid skin contact and inhalation of any fumes as the acid will cause deep skin burns and damage to the respiratory system.

Note: Disc check valves are non-maintainable (no spares are available). They are not suitable for use where heavily pulsating flow exists, such as close to a compressor.