NDR 520

Container systems A3 B3/4-t and container systems A4 B3/4-t

The low pressure regulator 520 is a 2nd stage pressure regulator for LPG, 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 520 low-pressure regulator is supplied with a pre-assembled thermal shut-off device (TAE).

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

PN 4 low pressure regulator – “t” – 12 kg/h
DVGW approved: According to EN 16129/ CE approved according to 2016/426/EG

TECHNICAL DATA
  • DVGW approved: According to EN 16129/ CE approved according to 2016/426/EG 
  • Inlet pressure: 0.5-4 bar

  • Inlet connection: G 1/2 “IG or others on request

  • Outlet connection: G 1/2 “IG or others on request

  • Capacity: 12 kg/h (propane)

  • Outlet pressure: 50 mbar

  • Overpressure safety shut-off valve (OPSO): 95-132 mbar

  • Thermally triggered shut-off device (TAE) already pre-assembled

  • Weight: 2 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 in a single stage to a nominal 50 mbar.
In the event of an impermissibly high increase in the outlet pressure at 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. The respective operating status of the OPSO can be seen on the visual display.

Clear = open
Red = closed

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 uncontrollably.

PRODUCT TYPES
Low pressure regulator NDR-520 with TAE Output pressure Performance Order number
NDR-520-TAE-G 1/2 IG x G 1/2 IG 50 mbar 12 kg/h 1 00 520 9 5 000 0
NDR-520-TAE-LVS15 x LVS15 50 mbar 12 kg/h 1 00 520 9 5 115 0
NDR-520-TAE-LVS18 x LVS18 50 mbar 12 kg/h 1 00 520 9 5 118 0
NDR-520-TAE-LVS22 x LVS22 50 mbar 12 kg/h 1 00 520 9 5 122 0
NDR-520-TAE-RVS15 x RVS15 50 mbar 12 kg/h 1 00 520 9 5 215 0
NDR-520-TAE-RVS18 x RVS18 50 mbar 12 kg/h 1 00 520 9 5 218 0
NDR-520-TAE-RVS22 x RVS22 50 mbar 12 kg/h 1 00 520 9 5 222 0
NDR-520-TAE-PVS15 x PVS15 50 mbar 12 kg/h 1 00 520 9 5 515 0
NDR-520-TAE-PVS18 x PVS18 50 mbar 12 kg/h 1 00 520 9 5 518 0
NDR-520-TAE-PVS22 x PVS22 50 mbar 12 kg/h 1 00 520 9 5 522 0
INSTALLATION AND OPERATING INSTRUCTIONS

 

PN 4 low pressure regulator – “t” – 12 kg/h
DVGW approved: According to EN 16129/ CE approved according to 2016/426/EG

TYPE NDR-520 with safety diaphragm

DESCRIPTION
The pressure regulator type 520 is a 2nd stage pressure regulator which reduces the regulated pressure from the 1st stage pressure regulator to a nominal 50 mbar outlet pressure. The pressure regulator is equipped with the following safety features: safety shut-off valve (OPSO) and a safety diaphragm.

A. INDIVIDUAL DESCRIPTIONS
1. Safety shut-off valve (OPSO)
The OPSO is open during normal operation and has the task of automatically shutting off the gas flow as soon as the set response pressure is reached.
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 fixed 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 pressure regulator reduces the regulated pressure from the 1st stage pressure regulator to a nominal 50 mbar.
In the event of an impermissibly high increase in the outlet pressure at 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. The visual indicator shows the operating status of the OPSO.

Clear = open
Red = closed

If there is a further increase in pressure, e.g. due to the OPSO not closing completely, the safety diaphragm prevents an uncontrolled gas flow. 

 

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

 

C. ASSEMBLY
Indoor installation “t”
The pressure regulator is installed indoors and is equipped with a fuse. There is no need to lead a blow-off line to the outside, as the pressure regulator has a safety diaphragm.
The ventilation opening 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. START-UP
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 at the pressure regulator (inlet side and outlet side)
– Twist off the plastic cap of the OPSO
– Pull out the OPSO plunger until it locks into place.
– Screw the plastic 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. 9
– Checking the outlet pressure: test port G1/8 no. 4
– Set pressure and function test of OPSO: test port G1/8 No. 4.

 

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.