NDR 820 to 824 with OPSO and PRV

• DVGW approved: According to EN 16129/ CE approved according to 2016/426/EC
• Capacity: 60-80 kg/h or 160 kg/h (Propan)
• Inlet pressure: 1-4 bar
• Outlet pressure: 29, 37, 50, 67,100 mbar or another on request
• Overpressure safety shut-off valve (OPSO): 70-160 mbar or another on request
• Overpressure safety relief valve (PRV): 120-190 mbar or another on request
• Inlet connection: G 1”IG or another on request
• Outlet connection: G 1”IG or another on request
• Weight: 5 kg
• Gas: LPG/LNG/Propane/Butane/Natural gas
• Operating temperature: -40°C to +80°C

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: An output of 160 kg/h is only achieved at an inlet pressure of 2.5 bar.

Low pressure regulator – PN 4
Mg: 60-80 kg/h or 160 kg/h
Pd: 29-100 mbar – OPSO: 70-160 mbar – PRV: 120-190 mbar
DVGW approved: According to EN 16129/ CE approved according to 2016/426/EG

Note: An output of 160 kg/h is only achieved at an inlet pressure of 2.5 bar.

TYP NDR-820 – 824 with OPSO & PRV

DESCRIPTION
The Type 820 – 824 pressure regulators are 2nd stage pressure regulators that 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 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. 2nd stage pressure regulator
The pressure regulator reduces the regulated pressure from the 1st stage pressure regulator to a fixed outlet pressure.

3. safety relief valve (PRV)
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.

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

If there is a further increase in pressure, e.g. due to the OPSO 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.

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

2. 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