U403 Emergency shut-valve

U403 Emergency shut-valve

U403 Series Emergency Shut-off Valve are installed on fuel supply lines beneath at grade level to minimize hazards associated with collision or fire at the dispenser. If the dispenser is pulled over or dislodged by collision, the top of the valve breaks off the flow of fuel. Single-poppet models shut off supply flow, while double-poppet models shut off supply as well as prevent release of fuel from the dispenser's internal piping. The base of the Emergency Valve is securely anchored to the concrete dispenser island through a stabilizer bar system within a U-Bolt Assembly. Valve inlet (bottom) connection are female pipe threads and outlet (top) connections are available with female threads, male threads, or a union fitting. Other options include suction system models with a normally closed secondary poppet which maintain prime, and models with external threads on inlet body which connect to secondary containment system.

Materials:

Body: cast iron(Spray-paint)

Surface: electronic Nickel plated

Seal : Buna-N O-ring

Features :

Flow rate: 0- 120 L/M

Working pressure: 0.2Mpa

Valve closing speed: 0.5s

Lowest shut-off temperature: 75 ?

Medium: water, gasoline, diesel, and kerosene

Operating Environment: -30 ~+55degree

Fire Protection- a fusible link trips the valve closed at 75 to shut off fuel

supply to the dispense.

Integral Test Port - a 3/8" Test Port allows the piping system to be air tested

without breaking any piping connection.

Low-Profile Tops- Female and Union-top double-poppet valves have a low-profile top to allow upgrading from single-poppet valves without changing existing piping.

100% Factory Tested.

Replacement Parts:

Key Description Weight

1 Protect pin

1 Cap(Single) 0.795kg

2 Cap(Double) 0.895kg

Package:

Net Weight Cross Weight Dimension

18kg/case of 6 20kg/case of 6 37.5x13.5x39 cm /case of 6

ection is small, pump suction is large; vice versa, large returned oil low suction distance. Diagram 2-5: Suction flow of vane pump Suction capacity of pump is restricted not only by its structure but also by the oil physical trait and pipeline. Under a certain temperature, air pocket phenomenon of oil will generated when vacuum reaching a given degree, so that the pump can’t suck oil normally. At high oil level, large resistance from pipeline, much higher vacuum pressure occurs at the inlet of pump; the higher temperature the more likely create air pocket. The phenomenon is likely to appear given the oil is gasoline. The phenomenon of cavitation is generated when partial pressure at inlet of pump is low than air pressure, the dissolved gas in oil begin separate out, and oil start gasifying vigorously as pressure getting down, reaching saturation pressure. The normal working of pump is affected due to a great of f fuel dispenser oam damaging the continuity of liquid flow. Fuel dispenser is likely come out any oil or work with large noise as the cavitation is severe. Components will be damaged in this long phenomen fuel dispenser on. At same time, oil vibration is increased so that the accuracy become down, as well as shorting service life of hydraulic components. The correlation between liquid saturation and gas pressure is illustrated in diagram 2-6. Diagram 2-6: Relations among temperature, steam pressure and liquid saturation Diagram 2-6 shows gasoline more likely to Air area than water and coal oil under the same pressure along with temperature increasing; under the same t fuel dispenser emperature the more vacuum pressure the earlier in air-area. There are two aspects that should be considered to prevent cavitation in pump inlet. One is that the design parameter of pump should be rational. The other is that pipeline should be installed scientifically. The effect of hydraulic pipe to fuel dispenser’s suction capacity will be introduced in detail. To understand the principle of cavitation and causation of affecting pump suction capacity is

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