Gas Products
We have been active in the Gas Market for decades in the field of overpressure protection of gas stations. We carry the 3/2 valve for this purpose.
Requesting a quote
Are you interested in and/or have questions about the SP2000 or our 3/2 Valve?
Then contact us or request a free quote here!
We will then contact you within 24 hours
3/2 Valve
The 3×2 manual switching valve is designed to change, by manual operation, a gas flow direction in a gas station control line.
SP 2000
Important features and characteristics
Since 1985, Combifit has been manufacturing the SP-2000 LD and HD to its own design. The SP-2000 is a certified pilot valve for monitoring the outlet pressures of gas pressure control stations (30mbar to 8bar) . The safety valve is suitable for inlet pressures up to 8bar (1/4″ connection).
The SP-2000 has been functionally inspected and certified by Lloyd's entirely according to Inspection Requirement 71. It has been pressure tested to 50 bar and falls into the highest accuracy class (NK1). It owes this high reliability to the low-friction construction of the plunger.
The SP-2000 is equipped with the necessary connection points for operating pressure (2 x Pb), outlet pressure (Pu) and inlet pressure (Pi). The free flow, at an inlet pressure of 1.5 bar, is over 10 m3/hour
A detailed manual is available and it comes with a 3-year warranty with a lifetime of 10 years of active service in the field. After this the recommendation is to replace it completely.
Material
The choice of material (Aluminum and stainless steel incl an effective protection) guarantees long-lasting operation and works well at low temperature (-20°C) and at high temperature (+50°C). The metal structural parts are resistant to 425°C.
Operation
The design ensures that when the exhaust pressure Pu to be secured exceeds the set pressure of the valve, the inlet pressure Pi flows into the measuring chamber. This immediately causes a ball to close the access of the outlet pressure Pu and the three-way plunger is driven down. The switching of the plunger creates a direct connection between the inlet pressure Pi connection and the outlet port Pb to the adjusting cylinder. This closes the safety valve and keeps it in the closed position. The SP-2000 cannot return to the guard position by itself, but must be reset on site. The SP-2000 operates completely autonomously.
Reset
After the fault is cleared and the outlet pressure is restored to its nominal value, pressing the single reset button returns the pilot mechanism to the guard position. This causes the rotary cylinder to empty and the safety valve can be opened manually.
Maintenance
Periodic maintenance should be performed according to the guidelines (which are they?), unless the TAO requires otherwise.
The setting range
Removing the adjustment cap on top of the valve provides access to the adjustment ring, which is used to set the desired response pressure.
Different versions of the SP allow an adjustment range from 1 mbar to 8.2 bar . Please contact us for the appropriate version if necessary.
Interested in our services?
Then request a no-obligation quote here!
3/2 valve
3/2 Manual switching valve
The 3/2 manual switching valve is designed to change, by manual operation, a gas flow direction in a control line of a gas station.
The 3/2 hand switch valve (1/4″ connection) is independent of the applied gas pressure and of the flow direction. The valve can be used for various applications and has full 8 mm orifice ports. The valve returns to its original position when released.
The other existing manual shift valves generally have limited clearance because the sealing o-rings pass over or along the inlet and outlet ports when shifting. If these ports are too large, there is a possibility that the o-rings could be damaged by the sharp edge of the port hole. Our valve does not suffer from that.
Combifit's 3/2 switching valve has connection ports of ø8.0 mm where other existing valves are usually equipped with a through-hole of ø3.0 mm.
The advantages of the full pass
- the valve can be placed in a supply line without restricting the required gas flow rate.
- when a valve or regulator is depressurized, the valve has sufficient flow capacity to pressurize the system in the desired time and in a controlled manner.
Operation of the valve
Fig.1 Operating mode
Fig.2 Switched
Pressing the switch button by hand against a spring action first breaks the existing flow connection and then establishes another passage for the gas. The force for manual switching is independent of gas pressure. Closing is also not affected by gas pressure.
Work Pressure & Safety
The maximum working pressure of the 3×2 valve is 30 Bar. At a maximum test pressure of 45 Bar, the valve can be easily switched by hand. The 3×2 switching valve was successfully pressurized to a pressure of 60 Bar.
Since the valve is spring-equipped and switching is done by depressing the spring, the valve will always return to the normal operating position as soon as the control knob is released.
Applications
The valve has three connection ports and can be used as follows.
- In a pressure compensation line around a valve, the operating output port can be closed with a plug, so that no gas flows through the valve when operating. Once the valve is depressed, a flow occurs to the third port to pressurize the system.
- If the valve is placed in a supply line, normal full passage from input to output can occur. Switching the valve manually shifts the passage to the other output to which a third line (test line or drain line) is connected. The first output is then automatically blocked.
- The valve can also be applied in reverse flow direction where two inputs are available and one output. This application can be used when connecting a test case. When switching, the normal supply is blocked and pressure can be applied from the test case to the safety to be checked.