NDR 520 (with AD)
Classification
2-stage regulator plant for indoor „t“
Low pressure regulator with safety diaphragm (AD) – PN 4
Mg: 12 kg/h – Pd: 50 mbar – OPSO: 132 mbar
DVGW approved: According to EN 16129/ CE approved according to 2016/426/EG
The low pressure regulator 520 is a 2nd stage pressure regulator for liquid gas, which reduces the regulated pressure from the 1st stage pressure regulator to a set outlet pressure.
As safety-related equipment, the regulator is equipped with a safety shut-off valve (OPSO) and a safety diaphragm.
The low-pressure regulator is supplied with a pre-assembled thermal armature protection (TAS).
The safety diaphragm means that no blow-off line to the outside is required.
The 1st stage is usually connected directly to the LPG tank via a medium pressure regulator 315/316, which must be purchased separately.
TECHNICAL DATA
- DVGW approved: According to EN 16129/ CE approved according to 2016/426/EG
- Capacity: 12 kg/h (propane)
- Inlet pressure: 0.5 – 4 bar
- Outlet pressure: 50 mbar or other on request
- Overpressure safety shut-off valve (OPSO): 132 mbar or other on request
- Safety diaphragm (AD)
- Thermal equipment trips (TAS) already pre-assembled
- Inlet connection: G 1/2 “IG or others on request
- Outlet connection: G1/2 “IG or others on request
- Weight: 2 kg
- Gas: LPG / LNG / propane / butane / natural gas or others on request
- Working temperature: -40°C to +80°C
OPERATING PRINCIPLES
The pressure regulator reduces the regulated pressure from the 1st stage pressure regulator to a nominal 50 mbar.
If the outlet pressure at the regulator rises to an impermissibly high level, the response pressure of the safety shut-off valve (OPSO) is reached, which then closes automatically and shuts off the gas flow upstream of the pressure regulator. The respective operating status of the OPSO can be seen on the visual display.
Clear = open
Red = closed
Should a further increase in pressure occur, e.g. due to the OPSO not closing completely, the safety diaphragm (AD) prevents an uncontrolled outflow of gas.
Safety diaphragm (AD) prevents the gas from escaping in an uncontrolled manner.
PRODUCT TYPES
| 2nd stage low pressure regulator NDR-520 (AD) | Outlet pressure | Capacity | Order number |
| NDR-520-TAS-G 1/2 IG x G 1/2 IG | 50 mbar | 12 kg/h | 1 00 520 9 5 000 0 |
| NDR-520-TAS-3/4 ÜWM x 3/4 ÜWM | 50 mbar | 12 kg/h | 1 00 520 9 5 100 0 |
| NDR-520-TAS-RVS15 x RVS15 | 50 mbar | 12 kg/h | 1 00 520 9 5 215 0 |
| NDR-520-TAS-RVS18 x RVS18 | 50 mbar | 12 kg/h | 1 00 520 9 5 218 0 |
| NDR-520-TAS-RVS22 x RVS22 | 50 mbar | 12 kg/h | 1 00 520 9 5 222 0 |
| NDR-520-TAS-PVS15 x PVS15 | 50 mbar | 12 kg/h | 1 00 520 9 5 515 0 |
| NDR-520-TAS-PVS18 x PVS18 | 50 mbar | 12 kg/h | 1 00 520 9 5 518 0 |
| NDR-520-TAS-PVS2 x PVS22 | 50 mbar | 12 kg/h | 1 00 520 9 5 522 0 |
INSTALLATION AND OPERATING INSTRUCTIONS
Low pressure regulator with safety diaphragm (AD) – PN 4
Mg: 12 kg/h – Pd: 50 mbar – OPSO: 132 mbar
DVGW approved: According to EN 16129/ CE approved according to 2016/426/EG
TYP NDR-520 with OPSO and Safety diaphragm (AD)
DESCRIPTION
The Type 520 pressure regulator is a 2nd stage pressure regulator that reduces the regulated pressure from the 1st stage pressure regulator to a nominal output pressure of 50 mbar. The pressure regulator is equipped with the following safety devices
safety shut-off valve (OPSO) and a safety diaphragm (AD).
A. INDIVIDUAL DESCRIPTIONS
1. safety shut-off valve (OPSO)
The OPSO is open during normal operation and has the function of automatically shutting off the gas flow as soon as the set response pressure is reached. It must be opened manually after closing.
2. 2nd stage pressure regulator
The pressure regulator reduces the regulated pressure from the 1st stage pressure regulator to a fixed outlet pressure.
3. safety diaphragm (AD)
If the OPSO does not function, the safety diaphragm (AD) prevents a dangerous amount of gas from escaping into the installation room.
installation room. A blow-off line is therefore not required..
B. MODE OF OPERATION
The pressure regulator reduces the regulated pressure from the 1st stage pressure regulator to a nominal 50 mbar.
If the outlet pressure at the regulator rises to an impermissibly high level, the response pressure of the safety shut-off valve (OPSO) is reached, which then closes automatically and shuts off the gas flow upstream of the pressure regulator. The respective operating status of the OPSO can be seen on the visual display.
Clear = open
Red = closed
Should a further increase in pressure occur, e.g. due to the OPSO not closing completely, the safety diaphragm (AD) prevents an uncontrolled outflow of gas.
Safety diaphragm (AD) prevents the gas from escaping in an uncontrolled manner.
C. ASSEMBLY
Indoor installation “t”
If the pressure regulator is installed inside the building, a thermally triggered shut-off device (fuse) must be connected upstream of it.
It is essential to ensure that a blow-off line is led from the PRV to the outside. The ventilation opening or blow-off line must always be
must always be open, otherwise the OPSO will lock due to pressure increase.
D. START-UP
Start-up is carried out by slowly opening the extraction valve on the liquid gas container.
If the OPSO has locked, the following steps are required:
- Close the extraction valve on the liquid gas container
- Relieve the pressure at the pressure regulator (inlet and outlet).
- Twist off the plastic cap of the OPSO
- Pull out the OPSO plunger until it engages.
- Screw the plastic cap back on
- Slowly open the extraction valve on the liquid gas container.
E. FUNCTION TEST OF THE PRESSURE REGULATOR
- Check the inlet pressure: test connection G1/4
- Checking the outlet pressure: test port G1/8
- Set pressure and function test of OPSO/PRV: test port G1/8
