UVA Overflow Valves
Overflow valves are dependent on back pressure; their components have not been tested individually. The rising stem is sealed by two chloroprene O-ring seals. Overflow valves are suitable for installation as:
- safety devices for controlling the high pressure side of compressors,
- safety devices in combination with two safety pressure control valves whose components have been tested,
- safety device for protection of closed pipe systems.
UVR/UVRK Overflow Valves
UVR overflow stop valves are a mechanical regulating system. The adjustable pressure range is 2 to 8 bar. The stem is used to close the valve. The valve is fitted with a PTFE back seal. This allows the stem sealing system (screw bushing) to be changed during operation. The damping system prevents “flattering” at low flow rates. The valve is back pressure dependent. overflow valves are suitable for installation as relief valves in the refrigerant cycles of industrial refrigerating plants. Overflow valves are safety devices for protecting the refrigerating plant or its components from excess pressure (see also DIN 8975 part 7). They comply with the technical regulations of the German Technical Control Board (TÜV).
Technical Features
- Available in steel or stainless steel
- DN25-32
- Selection of body material as per German DIN EN12284, AD2000 Series W
- Working media: glycol-based cold brine refrigerant EN 378 p. 1, e.g. NH3, R134a, R290 (propane), R507, blends with refrigerator oil, neutral, gas and liquid media, glycol-based cold brine
- Mounting position: vertical and horizontal
| UVA Overflow Valves | UVR/UVRK Overflow Valves | |
| design | angle type | straightway and angle type |
| material | steel or stainless steel | steel or stainless steel |
| nominal size | DN 10-32 | DN 20 |
| nominal pressure level | PS 25, PS 40, PS 63 | PS 25, PS 40 |
| temperature range | A: -60 °C to +180 °C B: -50 °C to +110 °C |
-60 °C to +150 °C |
| connection | butt welding ends DIN, ANSI flanged ends DIN, ANSI solder ends screwed ends |
butt welding ends DIN, ANSI |
| set pressure | 1-25 bar | 2-8 bar |
| other | optional with control cone (UVRK) | |