NDR 820 – 824
with OPSO and safety diaphragm

Container systems commercial & industrial

The low pressure regulators type 820-824 are 2nd stage pressure regulators for LPG, which reduce the regulated pressure from the 1st stage pressure regulator to a set outlet pressure. A safety shut-off valve (OPSO) and a safety diaphragm are fitted to the pressure regulators as safety-related equipment.
The NDR-820 to 824 are supplied with a pre-mounted thermal shut-off device (TAE).

The safety diaphragm means that no blow-off line to the outside is required.

PN 4 low pressure regulator – “f” – 60-150 kg/h
DVGW approved: According to EN 16129/ CE approved according to 2016/426/EG

TECHNICAL DATA NDR 820-824 incl. OPSO & safety diaphragm
  • DVGW approved: According to EN 16129/ CE approved according to 2016/426/EG
  • Nominal flow rate (propane): 60 – 150 kg/h
  • Nominal response pressure OPSO (SAV): 70 – 160 mbar
  • Safety diaphragm
  • Inlet pressure: 2 – 4 bar
  • Inlet: G 1″ IT or others on request
  • Outlet pressure: 29, 37, 50, 67, 100 mbar
  • Outlet: G 1″ IT or others on request
  • Thermally triggered shut-off device (TAE) already pre-assembled
  • Weight: 5 kg
  • Gas: LPG/LNG/Propane/Butane/Natural gas
  • Operating temperature: -40°C to +80°C
OPERATING PRINCIPLES

The low pressure regulator reduces the regulated pressure from the 1st stage pressure regulator to nominally 29 / 37 / 50 / 67 or 100 mbar.
In the event of an impermissibly high increase in the output pressure of the pressure regulator, 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.

If there is a further increase in pressure, e.g. due to the OPSO not closing completely, the safety diaphragm prevents the gas from flowing out unchecked.

Caution!
At an inlet pressure of 4 bar, a capacity of 150 kg/h is achieved.

PRODUCT TYPES
Low pressure regulators NDR-820 to 824 with TAE, OPSO and safety diaphragm
Outlet pressure Performance Order Number
NDR-820-G 1 IG x G 1 IG-OPSO-SM-TAE 29 mbar 60 – 80 kg/h 1 00 820 9 5 001 0
NDR-820-G 1 IG x G 1 IG-OPSO-SM-TAE 29 mbar 150 kg/h 1 00 820 9 5 001 1
NDR-821-G 1 IG x G 1 IG-OPSO-SM-TAE 37 mbar 60 – 80 kg/h 1 00 821 9 5 001 0
NDR-821-G 1 IG x G 1 IG-OPSO-SM-TAE 37 mbar 150 kg/h 1 00 821 9 5 001 1
NDR-822-G 1 IG x G 1 IG-OPSO-SM-TAE 50 mbar 60 – 80 kg/h 1 00 822 9 5 001 0
NDR-822-G 1 IG x G 1 IG-OPSO-SM-TAE 50 mbar 150 kg/h 1 00 822 9 5 001 1
NDR-823-G 1 IG x G 1 IG-OPSO-SM-TAE 67 mbar 60 – 80 kg/h 1 00 823 9 5 001 0
NDR-823-G 1 IG x G 1 IG-OPSO-SM-TAE 67 mbar 150 kg/h 1 00 823 9 5 001 1
NDR-824-G 1 IG x G 1 IG-OPSO-SM-TAE 100 mbar 60 – 80 kg/h 1 00 824 9 5 001 0
NDR-824-G 1 IG x G 1 IG-OPSO-SM-TAE 100 mbar 150 kg/h 1 00 824 9 5 001 1
INSTALLATION AND OPERATING INSTRUCTIONS

PN 4 low pressure regulator – “f” – 60-150 kg/h
DVGW approved according to EN 16129/ CE approved according to 2016/426/EC

TYPE NDR 820 – 824 with OPSO & safety diaphragm

DESCRIPTION
The low pressure regulators type 820 – 824 are pressure regulators of the 2nd stage, which reduce the regulated pressure from the pressure regulator of the 1st stage to a set outlet pressure. A safety shut-off valve (OPSO) and a safety diaphragm are mounted on the pressure regulators as safety-related equipment.

A. INDIVIDUAL DESCRIPTIONS
1. Safety shut-off valve (OPSO)
The OPSO is open during normal operation and is designed to automatically shut off the gas flow when the set response pressure is reached. It must be opened manually after closing.

2. Pressure regulator
The pressure regulator reduces the regulated pressure from the 1st stage pressure regulator to a set outlet pressure.

3. Safety diaphragm
In the event of a malfunction of the OPSO, the safety diaphragm prevents a dangerous quantity of gas from escaping into the installation room. A blow-off line is therefore not required.

B. MODE OF OPERATION
The low pressure regulator reduces the unregulated pressure from the 1st stage pressure regulator to nominally 20 / 30 / 50 / 70 or 100 mbar. In the event of an impermissibly high increase in the outlet pressure of the pressure regulator, 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.
If there is a further increase in pressure, e.g. due to the OPSO not closing completely, the safety relief valve (OPSO) will automatically release a limited amount of the gas flow into the atmosphere after reaching the set response pressure.

CAUTION! All activities described in points C, D and E may only be carried out by authorised specialist personnel.

C. ASSEMBLY
1. Outdoor installation “f”
In this case, the low-pressure regulator is mounted on the building in front of the house inlet in a house connection box.

2. Indoor installation “t”
The pressure regulator is installed inside the building and is equipped with a fuse. There is no need No blow-off line must be led into the open air, as the pressure regulator is equipped with a safety diaphragm.
The vent must always be open, otherwise the OPSO will lock due to pressure increase.

IMPORTANT! • Only use proper tools for assembly. – Prevent sealants from getting into the gas-carrying components. – Always counteract threaded connections with suitable spanners. – After assembly, a careful leak test must be carried out.

D. COMMISSIONING
Start-up is carried out together with the 1st stage pressure regulator. The main shut-off valve must be opened slowly.
If the OPSO has locked, the following steps are required:

  • Close the main shut-off valve
  • Relieve the pressure on the pressure regulator (inlet and outlet).
  • Twist off the brass cap of the OPSO
  • Pull out the OPSO tappet until it engages
  • Screw the brass cap back on
  • Slowly open the main shut-off valve

E. FUNCTIONAL TEST OF THE PRESSURE REGULATOR

  • Checking the inlet pressure: test port G1/4 no. 7
  • Checking the outlet pressure: test port G1/8 no. 3
  • Set pressure and function test of OPSO: test port G1/8 no. 3

During the test, the gas supply must be interrupted and the consumer unit closed. A safe and quick function test can be carried out with the “Müller-Test-Device”.