Angular shape, spring-loaded, body: 1.4408, spring: stainless steel, seal cap prevents unauthorized changing of set
pressure, set pressure: 0,5 … 70 bar
K: twist-type lifting mechanism, L: Lifting lever, O: without lifting device
Seat: N: NBR (-30°C … +130°C), F: FKM (-20°C … +200°C), P: PTFE (-60°C … +225°C), E: EPDM (-40°C … +170°C),
with extra costs: m: metal (-60°C … +400°C)
Type 451 sF: non-gastight version of spring housing, for neutral liquid without counter pressure
Type 451 sG: non-gastight version of spring housing, for neutral air, vapours, gases without counter pressure
Type 451 bF: with bellows, for neutral and non-neutral liquid and/or counter pressure up to 4 bar
Type 451 bG: with bellows, for neutral and non-neutral air, vapours, gases and/or counter pressure up to 4 bar
Type 451 tGFO: gastight version of spring housing, for neutral and non-neutral media without counter pressure,
without lifting device
Type 451 tbGFO: gastight version with bellows, for neutral and non-neutral, flammable, toxic and environmentally
hazardous media and/or counter pressure up 4 bar, without lifting device
Angular shape, spring-loaded, body red brass, spring: stainless steel, seal cap prevents unauthorized changing of set
pressure, set pressure: 0,5 … 50 bar
K: twist-type lifting mechanism, L: Lifting lever, O: without lifting device
Seat: N: NBR (-30°C … +130°C), F: FKM (-20°C … +200°C), P: PTFE (-60°C … +225°C), E: EPDM (-40°C … +170°C)
with extra costs: m: metal (-60°C … +225°C)
Type 851 sF: non-gastight version of spring housing, for neutral liquid without counter pressure
Type 851 sG: non-gastight version of spring housing, for neutral air, vapours, gases without counter pressure
Type 851 bF: with bellows, for neutral and non-neutral liquid and/or counter pressure up to 4 bar
Type 851 bG: with bellows, for neutral and non-neutral air, vapours, gases and/or counter pressure up to 4 bar
Type 851 tFO / tGO: gastight version of spring housing, for neutral and non-neutral media without counter pressure,
without lifting device
Type 851 tbFO / tbGO: gastight version with bellows, for neutral and non-neutral, flammable, toxic and
environmentally hazardous media and/or counter pressure up 4 bar, without lifting device
Safety valve according to TRD 421 and AD Merkblatt A2, angle pattern
Fig. 12.901 / 12.912 / 12.911 / 12.902: PN 16, body: EN-JL1040 (GG-25), max. 300°C
Fig. 25.901 / 25.912 / 25.911 / 25.902: PN 40, body: EN-JS1049 (GGG-40.3), max. 350°C
Fig. 35.901 / 35.912 / 35.911 / 35.902: PN 40, body: 1.0619+N (GS-C25), max. 450°C
Fig. 55.901 / 55.911: PN 40, body: 1.4408, max. 400°C
Heating safety valve according to TRD 721, angle pattern
Fig. 12.903: PN 16, body: GG-25, with EPDM-bellow and EPDM-seat,
for heating systems up to 120°C
Safety valve according to TRD 421 and AD Merkblatt A2, angle pattern
Fig. 12.921 / 12.922 / 12.923 / 12.924: PN 16, body: EN-JL1040 (GG-25), max. 300°C
Fig. 35.921 / 35.922 / 35.923 / 35.924: PN 40, body: 1.0619+N (GS-C25), max. 450°C
Fig. 55.921 / 55.923: PN 40, body: 1.4408, max. 400°C
