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Pressure Retaining Valve made of PTFE - back pressure safe

Product specification Resistant to weather Good mechanical stability High chemical... more

Product specification

Resistant to weather

Good mechanical stability

High chemical resistance

High tracking resistance

Technical specification

Material:

Lower valve body: PTFE (polytetrafluoroethylene), black

Upper valve body: PP (polypropylene), glass fibre-reinforced, orange (RAL 2005)

Piston: PTFE (polytetrafluoroethylene)

Separation disc: PTFE (polytetrafluoroethylene)

Diaphragm: EPDM (ethylene-propylene-diene rubber), on media side PTFE-coated

Valve seat seal: PTFE (polytetrafluoroethylene)

O-ring sealings of union ends: EPDM (ethylene-propylene-diene rubber); FPM (fluorinated rubber)

Connecting screws: stainless steel 1.4301 (V2A)

Media: technically pure, neutral and aggressive liquids provided that the selected valve materials are resistant at working temperature

Max. temperature: +100 °C

Max. operating pressure: 10 bar at +20 °C

Pressure setting range: 0.3 - 10 bar

Pressure settings: in 0.5 bar steps, between 0.5 and 10 bar

Release pressure: approx. 0.5 bar

Hysteresis: approx. 0.3 bar

Mounting position: optional

Connection: External thread (DIN 8063)

General Information In process plants for maintenance of working- or system-induced counter... more

General Information

In process plants for maintenance of working- or system-induced counter pressures as well as for reduction of pressure pulsation. The special diaphragm design and the interaction of diaphragm surface, valve piston and valve seat keep the working pressure at occurring counter pressure almost constant.

As pressurizing valve in metering pumps for guarantee of metering accuracy. In case of counter pressure at the secondary side the preliminary pressure and thus the metering quantity remain constant.

In all working areas where constant pressure is required.

Operating principle:

Does the working pressure or inlet pressure rise above a certain preset pressure value, the pressurized valve piston is lifted against the spring force. The valve opens and a pressure relief on the outlet side takes place. It closes as soon as the working pressure at the valve piston drops below preset spring force. If a system determined counter pressure arises at the secondary side this pressure has an impact on both simultaneously, namely under the diaphram and on the valve piston, i.e. the forces cancel out each other because the diaphragm and the valve mating surface / effective surface are the same size. The valve force and thus the working pressure remain nearly constant.

Item Image NW
mm
External thread d
mm
Material gasket Unit
piece
Price
Euro*
Buy
350867
10 G 3/4" 16 PTFE 1 686.00
350868
15 G 1" 20 PTFE 1 686.00
350869
20 G 1 1/4" 25 PTFE 1 1,018.00
350870
25 G 1 1/2" 32 PTFE 1 1,018.00
350871
32 G 2" 40 PTFE 1 1,574.00
350872
40 G 2 1/4" 50 PTFE 1 1,574.00
350873
50 G 2 3/4" 63 PTFE 1 1,574.00
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