Pressure Retaining Valve made of PVDF - back pressure safe

Product specification Resistant to corrosion and weather High impact toughness even at low... more

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Product specification

Resistant to corrosion and weather

High impact toughness even at low temperatures

High mechanical stability

High chemical resistance

Technical specification

Material:

Lower valve body: PVDF (polyvinylidene fluoride), yellowish-white

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

Piston: PVDF (polyvinylidene fluoride)

Separation disc: PVDF (polyvinylidene fluoride)

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

Valve seat seal: EPDM (ethylene-propylene-diene rubber); FPM (fluorinated rubber)

O-ring sealings of union ends: EPDM and FPM resp.

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: butt fusion spigot or socket fusion spigot or screw joint with welded socket

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

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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	NW mm	Connection	Material gasket	Unit piece	Price Euro*
350839	10	Schweißstutzen (Stumpf/Muffe) 16 mm	EPDM	1	672.00
350840	15	Schweißstutzen (Stumpf/Muffe) 20 mm	EPDM	1	672.00
350841	20	Schweißstutzen (Stumpf/Muffe) 25 mm	EPDM	1	1,010.00
350842	25	Schweißstutzen (Stumpf/Muffe) 32 mm	EPDM	1	1,010.00
350843	32	Schweißstutzen (Stumpf/Muffe) 40 mm	EPDM	1	1,590.00
350844	40	Schweißstutzen (Stumpf/Muffe) 50 mm	EPDM	1	1,590.00
350845	50	Schweißstutzen (Stumpf/Muffe) 63 mm	EPDM	1	1,590.00
350846	10	Verschraubung mit Schweißmuffe 16 mm	EPDM	1	708.00
350847	15	Verschraubung mit Schweißmuffe 20 mm	EPDM	1	708.00
350848	20	Verschraubung mit Schweißmuffe 25 mm	EPDM	1	1,060.00
350849	25	Verschraubung mit Schweißmuffe 32 mm	EPDM	1	1,080.00
350850	32	Verschraubung mit Schweißmuffe 40 mm	EPDM	1	1,646.00
350851	40	Verschraubung mit Schweißmuffe 50 mm	EPDM	1	1,682.00
350852	50	Verschraubung mit Schweißmuffe 63 mm	EPDM	1	1,742.00
350853	10	Schweißstutzen (Stumpf/Muffe) 16 mm	FPM	1	684.00
350854	15	Schweißstutzen (Stumpf/Muffe) 20 mm	FPM	1	684.00
350855	20	Schweißstutzen (Stumpf/Muffe) 25 mm	FPM	1	1,018.00
350856	25	Schweißstutzen (Stumpf/Muffe) 32 mm	FPM	1	1,018.00
350857	32	Schweißstutzen (Stumpf/Muffe) 40 mm	FPM	1	1,574.00
350858	40	Schweißstutzen (Stumpf/Muffe) 50 mm	FPM	1	1,574.00
350859	50	Schweißstutzen (Stumpf/Muffe) 63 mm	FPM	1	1,576.00
350860	10	Verschraubung mit Schweißmuffe 16 mm	FPM	1	722.00
350861	15	Verschraubung mit Schweißmuffe 20 mm	FPM	1	728.00
350862	20	Verschraubung mit Schweißmuffe 25 mm	FPM	1	1,066.00
350863	25	Verschraubung mit Schweißmuffe 32 mm	FPM	1	1,644.00
350864	32	Verschraubung mit Schweißmuffe 40 mm	FPM	1	1,660.00
350865	40	Verschraubung mit Schweißmuffe 50 mm	FPM	1	1,700.00
350866	50	Verschraubung mit Schweißmuffe 63 mm	FPM	1	1,760.00