Description
Product Overview
Spirax Sarco DCV41 is an austenitic stainless steel disc check valve engineered in sizes from 1/2” to 2” with screwed or socket weld pipe connections. It prevents reverse fluid motion across process lines, hot water installations, steam distributions, and condensate return lines. Opening occurs automatically through upstream line pressure, and shut-off is initiated by spring reaction as flow ceases, stopping backflow prior to flow reversal.
The DCV41 is produced in a fully welded, non-maintainable stainless steel body rated to PN50. Standard metal-seated models provide shut-off conforming to EN 12266-1 Rate E (DIN 3230 BN2). For applications requiring zero leakage or bubble-tight shut-off under differential pressure, optional soft-seated variants meet EN 12266-1 Rate A (DIN 3230 BN1/BO1) with Viton or EPDM sealing elements on screwed connections. The DCV41 Food+ variant covers 1/2” to 2” sizes in metal-seated and EPDM configurations, certified under European and FDA food contact regulations.
Key Features
- Austenitic stainless steel construction utilizing ASTM A351 CF3M body and seat components with ASTM A276 316 disc.
- Pressure rating PN50 with maximum allowable operating pressure of 49.6 bar g at 38 °C and cold hydraulic test capability to 76 bar g.
- Maximum operating temperature reach of 300 °C with standard spring, extended to 400 °C with high-temperature Nimonic 90 spring or springless configuration.
- Soft-seated options delivering EN 12266-1 Rate A bubble-tight shut-off (Viton for oils and gases up to 205 °C, EPDM for water up to 120 °C).
- Heavy-duty spring option (nominal 700 mbar opening pressure) configured with EPDM seat for boiler feedwater check service.
- Flexible mounting orientation in any plane when spring-loaded, or bottom-to-top vertical orientation when supplied without spring.
- Food contact compliance on DCV41 Food+ models in accordance with (EC) 1935/2004, (EC) 2023/2006, (EU) 10/2011, and FDA 21 CFR regulations.
- European Pressure Equipment Directive 2014/68/EU compliance across all sizes.
Technical Specifications
| Parameter | Specification Details |
|---|---|
| Valve Design Standard | BS 7438 |
| Pressure Rating | PN50 |
| Body Maximum Allowable Pressure (PMA) | 49.6 bar g @ 38 °C (719 psi g @ 100 °F) |
| Body Maximum Allowable Temperature (TMA) | 400 °C @ 29.4 bar g (752 °F @ 426 psi g) |
| Minimum Allowable Temperature | -29 °C (-20.2 °F) |
| Maximum Operating Pressure (PMO) | 49.6 bar g @ 38 °C (719 psi g @ 100 °F) |
| TMO - Standard Spring & Metal Seat | 300 °C (572 °F) |
| TMO - High Temperature Spring (Nimonic 90) | 400 °C (752 °F) |
| TMO - Without Spring (Metal Seat) | 400 °C (752 °F) |
| TMO - Viton Soft Seat | 205 °C (401 °F) |
| TMO - EPDM Soft Seat | 120 °C (248 °F) |
| Minimum Operating Temperature (Metal Seat) | -29 °C (-20 °F) |
| Minimum Operating Temperature (Viton Seat) | -25 °C (-13 °F) |
| Minimum Operating Temperature (EPDM Seat) | -40 °C (-40 °F) |
| Hydraulic Test Pressure | 76 bar g (1102 psi g) |
| Vacuum Suitability | Safe for full vacuum conditions |
| Standard Seat Shut-Off Classification | EN 12266-1 Rate E (DIN 3230 BN2) |
| Soft Seat Shut-Off Classification | EN 12266-1 Rate A (DIN 3230 BN1, DIN 3230 BO1) |
| End Connection Sizes | 1/2”, 3/4”, 1”, 1 1/4”, 1 1/2”, 2” |
| Pipe Connection Types | Screwed BSP T Rp (ISO 7-1), Screwed NPT (ASME B1.20.1), Socket weld (ASME B16.11 Class 3000) |
| Pressure Equipment Directive Category | DN15-DN25: SEP (Group 2 Gas & Liquid); DN32: SEP; DN40-DN50: Category 1 (Group 2 Gases), SEP (Group 2 Liquids) |
Applications
- Steam distribution networks and high-temperature condensate return branches.
- Process pipelines carrying Group 2 industrial gases and non-hazardous industrial fluids.
- Hot water and chilled water recirculation circuits.
- Oil and non-corrosive gas pipelines utilizing Viton soft seats.
- Boiler feedwater supply lines equipped with heavy-duty spring (700 mbar) and EPDM seat.
- Food and beverage steam/condensate utility lines with DCV41 Food+ compliance.
Materials of Construction
| Item No. | Component Part | Material Grade | Standard Reference |
|---|---|---|---|
| 1 | Body | Austenitic stainless steel | ASTM A351 CF3M |
| 2 | Seat | Austenitic stainless steel | ASTM A351 CF3M |
| 3 | Disc | Austenitic stainless steel | ASTM A276 316 (BS 1449 316 S11) |
| 4 | Standard Spring | Austenitic stainless steel | BS 2056 316 S42 |
| 4 | Heavy Duty Spring | Austenitic stainless steel | BS 2056 316 S42 |
| 4 | High Temperature Spring | Nickel alloy | Nimonic 90 |
Dimensions and Weights
| Nominal Size | Dimension A Socket Weld mm (in) | Dimension A Screwed mm (in) | Dimension B (Across Flats) mm (in) | Weight kg (lb) |
|---|---|---|---|---|
| 1/2” (DN15) | 50 (1.97) | 51 (2.01) | 34 (1.34) | 0.2 (0.44) |
| 3/4” (DN20) | 55 (2.17) | 57 (2.24) | 41 (1.61) | 0.3 (0.66) |
| 1” (DN25) | 67 (2.64) | 68 (2.68) | 50 (1.97) | 0.5 (1.1) |
| 1 1/4” (DN32) | 100 (3.94) | 100 (3.94) | 80 (3.15) | 2.0 (4.4) |
| 1 1/2” (DN40) | 100 (3.94) | 100 (3.94) | 80 (3.15) | 2.0 (4.4) |
| 2” (DN50) | 100 (3.94) | 100 (3.94) | 80 (3.15) | 2.0 (4.4) |
Opening Pressures and Flow Coefficients
Flow coefficient values by size:
| Size | 1/2” | 3/4” | 1” | 1 1/4” | 1 1/2” | 2” |
|---|---|---|---|---|---|---|
| Kv (m³/h) | 4.4 | 7.5 | 12.0 | 30.0 | 35.0 | 35.0 |
Conversion factors: Cv (UK) = Kv × 0.963; Cv (US) = Kv × 1.156.
Opening differential pressures in mbar (zero flow):
| Spring Configuration | Flow Direction | 1/2” | 3/4” | 1” | 1 1/4” to 2” |
|---|---|---|---|---|---|
| Standard / High Temperature Spring | Vertical upward (↑) | 25.0 (0.36 psi) | 25.0 (0.36 psi) | 25.0 (0.36 psi) | 25.0 (0.36 psi) |
| Standard / High Temperature Spring | Horizontal (→) | 22.5 (0.33 psi) | 22.5 (0.33 psi) | 22.5 (0.33 psi) | 22.5 (0.33 psi) |
| Standard / High Temperature Spring | Vertical downward (↓) | 20.0 (0.29 psi) | 20.0 (0.29 psi) | 20.0 (0.29 psi) | 20.0 (0.29 psi) |
| Without Spring | Vertical upward (↑) | 3.0 (0.044 psi) | 2.5 (0.036 psi) | 4.0 (0.058 psi) | 6.5 (0.094 psi) |
| Heavy Duty Spring | All directions | ~700 (10.2 psi) | ~700 (10.2 psi) | ~700 (10.2 psi) | ~700 (10.2 psi) |
Body Identification Codes
Valve configurations are identified by markings stamped on the outer valve body:
| Body Marking | Internal Configuration Description |
|---|---|
| Unmarked | Standard spring, standard metal seat |
| ‘N’ | High temperature spring, standard metal seat |
| ‘W’ | Without spring, standard metal seat |
| ‘WV’ | Without spring, Viton soft seat |
| ‘WE’ | Without spring, EPDM soft seat |
| ‘H’ | Heavy duty spring, standard metal seat |
| ‘HV’ | Heavy duty spring, Viton soft seat |
| ‘HE’ | Heavy duty spring, EPDM soft seat |
| ‘V’ | Standard spring, Viton soft seat |
| ‘E’ | Standard spring, EPDM soft seat |
Installation and Safety Guidelines
- Fit the check valve strictly observing the directional arrow marked on the valve body. Spring-loaded valves may be installed in any plane; valves supplied without a spring must be installed in vertical lines with flow directed strictly upward.
- Disc check valves must not be installed in applications with severe pulsating flow, such as directly adjacent to reciprocating compressors.
- Soft-seated options (Viton and EPDM) are available solely with screwed connections; they are not available with socket weld connections.
- This product features a fully welded construction and is non-maintainable. No replacement spare parts are offered.
- Prior to operating DCV41 Food+ check valves in food contact systems, execute a validated Clean-in-Place (CIP) cycle to eliminate potential non-intentionally added substances.
- Safety warning regarding Viton seals: exposure to temperatures at or above 315 °C causes material decomposition into toxic hydrofluoric acid. Avoid skin contact or fume inhalation, and dispose of fluorocarbon residues in compliance with environmental regulations.