Danfoss DSV Change-Over Valves
DSV 10, DSV 1 and DSV 2 are change-over valves designed specifically for double safety valve systems in industrial refrigeration. One DSV sits between two safety valves (SFA / BSV / SFV): turning the spindle connects the inlet port to one valve or the other, so a safety valve can be inspected or replaced without shutting down the plant.
The valve cone is designed for perfect closing with minimum torque; all valves have a vented cap and nipple/flange connections, and valves and caps are prepared for seal wire to prevent unauthorized operation.
Wenzhou Phonetoo Electromechanical Co., Ltd. is an authorized Danfoss distributor in China. Contact us for availability, pricing and delivery time.
Range
| Type | Max. operating pressure | For use with | Temp. range |
|---|---|---|---|
| DSV 10 | 65 bar | 2 × SFA 10 / SFA 10H | –50 – +100 °C |
| DSV 1 | 40 bar | 2 × SFA 15 / BSV 8 | –50 – +100 °C |
| DSV 2 | 40 bar | 2 × SFA 15, or 2 × SFV 20, or 2 × SFV 25 | –50 – +100 °C |
These combinations meet EN 13136 regarding max. 3% pressure drop in the upstream line.
Key features
- For double safety valve systems — service one valve while the other protects the plant
- Housing and bonnet in low-temperature steel per Pressure Equipment Directive
- Teflon cone seal for perfect closing with minimum torque
- “Full temperature range” packing gland with scraper ring: tight from –50 °C to +100 °C
- Accepts flow in both directions; easy to dismantle for servicing
- Prepared for seal wire (valves and caps)
- Refrigerants: HCFC, non-flammable HFC, R717 (ammonia), R744 (CO2); closed circuits only
- Classification: EAC
Confirm the exact DSV type and code number in your RFQ and we will quote it.
Applications
- Double safety valve stations on receivers, condensers and vessels
- Any industrial refrigeration plant where safety valves must remain in service during inspection
Code numbers
Ordering codes for Danfoss DSV 10, DSV 1 and DSV 2 change-over valves, fittings, gaskets and accessories. Confirm the exact type and code number in your RFQ and we will quote it.
| Valve type | DSV inlet connection | DSV outlet connection | SFA/SFV outlet connection | Safety valve combination | Code no. |
|---|---|---|---|---|---|
| DSV 10 G | ND15 (1⁄2 in.) RH | G ½ in. Union | ND15 (1⁄2 in.) | SFA 10(H) T | 148F3054 |
| DSV 10 NPT | NPT (¾ in.) Male | NPT (1⁄2 in.) Female | NPT (¾ in.) Male | SFA 10(H) NPT | 148F3055 |
| DSV 1 | D25 (1 in.) | G ¾ in. Union | ND20 (¾ in.) | SFA 15/BSV 8 | 148F3005 |
| DSV 2 | FD20 (¾ in.) | G ¾ in. thread flange | ND20 (¾ in.) | SFA 15/BSV 8 | 148F3006 |
| DSV 2 | FD25 (1 in.) | G ¾ in. thread flange | ND20 (¾ in.) | SFA 15/BSV 8 | 148F3007 |
| DSV 2 | FD32 (1¼ in.) | G ¾ in. thread flange | ND20 (¾ in.) | SFA 15/BSV 8 | 148F3008 |
| DSV 2 | FD25 (1 in.) | G 1¼ in. thread flange | FD25 (1 in.) | SFV 20 | 148F3009 |
| DSV 2 | FD32 (1¼ in.) | G 1¼ in. thread flange | FD25 (1 in.) | SFV 20 | 148F3010 |
| DSV 2 | FD32 (1¼ in.) | G 1¼ in. thread flange | FD32 (1¼ in.) | SFV 25 | 148F3011 |
| Fittings and gaskets | |||||
| Nipples + Gaskets set for ND15/ND15 DSV 10 G/SFA 10(H) T | 148F3067 | ||||
| Nipples + gaskets set for 25D/ND20 DSV 1/SFA 15/BSV 8 | 148F3037 | ||||
| Flanges + gaskets set for FD20/ND20 DSV 2/SFA 15/BSV 8 | 148F3038 | ||||
| Flanges + gaskets set for FD25/ND20 DSV 2/SFA 15/BSV 8 | 148F3039 | ||||
| Flanges + gaskets set for FD32/ND20 DSV 2/SFA 15/BSV 8 | 148F3040 | ||||
| Flanges + gaskets set for FD25/FD25 DSV 2/SFV 20 | 148F3041 | ||||
| Flanges + gaskets set for FD32/FD25 DSV 2/SFV 20 | 148F3042 | ||||
| Flanges + gaskets set for FD32/FD32 DSV 2/SFV 25 | 148F3043 | ||||
| Accessories | |||||
| DSV 10 G Cap and alu gasket for testing (1 set) | 148F3063 | ||||
| DSV 10 T Plug 1⁄2” NPT for testing (1 set) | 148F3072 | ||||
Note: Above code numbers include DSV valve, DSV inlet connection fitting, DSV outlet connection fitting, SFA/BSV/SFV outlet connection fittings and necessary seals. Safety valves SFA/BSV/SFV must be ordered separately.