NDR 820 – 824
with OPSO und PRV

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 relief valve (PRV) are fitted to the pressure regulators as safety-related equipment.

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

Data Sheet
Operating and assembly instructions
TECHNICAL DATA NDR 820-824 with OPSO & PRV
  • DVGW approved: According to EN 16129/ CE approved according to 2016/426/EC
  • Inlet pressure: 1-4 bar
  • Inlet connection: G 1 “IG or others on request
  • Outlet connection: G 1 “IG or others on request
  • Capacity: 60-150 kg/h (propane)
  • Outlet pressure: 29, 37, 50, 67, 100 mbar
  • Overpressure safety shut-off valve (OPSO): 70-150 mbar
  • Overpressure safety relief valve (PRV): 120-190 mbar
  • Weight: 5 kg
  • Gas: LPG/LNG/Propane/Butane/Natural gas
  • Operating temperature: -40°C to +80°C
OPERATING PRINCIPLES

The low-pressure regulators reduce the regulated pressure from the 1st stage pressure regulator in a single stage to nominally 29/37/50/67 or 100 mbar. In the event of an impermissibly high increase in the regulator’s outlet pressure, 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 regulator. If there is a further increase in pressure, e.g. due to the OPSO not closing completely, the safety relief valve (PRV) will automatically release a limited amount of the gas flow to the atmosphere after the set response pressure has been reached.

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

PRODUCT TYPES
Low pressure regulator NDR-820 to 824 with OPSO and PRV Outlet pressure Performance Order number
NDR-820-G1 IG x G1 IG-OPSO-PRV 29 mbar 60 – 80 kg/h 1 00 820 8 5 001 0
NDR-820-G1 IG x G1 IG-OPSO-PRV 29 mbar 150 kg/h 1 00 820 8 5 001 1
NDR-821-G1 IG x G1 IG-OPSO-PRV 37 mbar 60 – 80 kg/h 1 00 821 8 5 001 0
NDR-821-G1 IG x G1 IG-OPSO-PRV 37 mbar 150 kg/h 1 00 821 8 5 001 1
NDR-822-G1 IG x G1 IG-OPSO-PRV 50 mbar 60 – 80 kg/h 1 00 822 8 5 001 0
NDR-822-G1 IG x G1 IG-OPSO-PRV 50 mbar 150 kg/h 1 00 822 8 5 001 1
NDR-823-G1 IG x G1 IG-OPSO-PRV 67 mbar 60 – 80 kg/h 1 00 823 8 5 001 0
NDR-823-G1 IG x G1 IG-OPSO-PRV 67 mbar 150 kg/h 1 00 823 8 5 001 1
NDR-824-G1 IG x G1 IG-OPSO-PRV 100 mbar 60 – 80 kg/h 1 00 824 8 5 001 0
NDR-824-G1 IG x G1 IG-OPSO-PRV 100 mbar 150 kg/h 1 00 824 8 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 & PRV

DESCRIPTION
The pressure regulators type 820 – 824 are 2nd stage pressure regulators 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 relief valve (PRV) are fitted to the pressure regulators as safety-related equipment.

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

3. Safety relief valve (SRV)
The PRV is closed during normal operation and has the task of automatically releasing the gas flow as soon as the pressure in the system to be protected has reached the set pressure.
It closes again automatically when the pressure drops below the set pressure.

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 SAV not closing completely, the safety relief valve (PRV) automatically releases a limited amount of the gas flow to the atmosphere after the set response pressure has been reached.

 

ATTENTION ! 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”
If the pressure regulator is installed in 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 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 keys. – After assembly, a careful leak test must be carried out.

 

D.

D. START-UP
Start-up is carried out together with the pressure regulator of the 1st stage. 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 plunger until it locks into place.
– Screw the brass cap back on
– Slowly open the main shut-off valve

E. FUNCTION TEST OF THE PRESSURE REGULATOR
– Check the inlet pressure: test port G1/4 no. 7
– Check the outlet pressure: test port G1/8 no. 3
– Set pressure and function test of OPSO/PRV: 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”. A leak test must be carried out after each test.

 

 

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