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Pressure Transducer
Pressure transducer in an all-plastic housing for relative pressure measurements for 0-10 bar (0-150 psi).
The pressure transducer type 3120 converts the physical variable pressure proportionally into an electrical signal. It is available in the form of a two-wire transducer (4-20mA) and as a pressure measuring instrument with an optional power (0/4-20mA) or relay output (MIN and MAX switching points). The pick-up is temperature compensated.
The element connecting the transducer to the pipeline is configured as standard with male thread, optionally to DIN 3852 or DIN 16288, in sizes G 1/4 A, G 1/2 A and G 3/4 A.
Electrical connections are effected using an electrical plug in compliance with DIN 43650, PG 11.
The transducer can be mounted in any position.
After screwing in the connecting element, the upper part of the housing can be turned up to ±180° to the required position by releasing the fastening screws.
Components coming into contact with the medium are made of PVDF or stainless steel, the housing is made of ABS and the seal of FPM. Other seal materials are available on request.
Type 3120
Flow Transmitter
Flow transmitter featuring non-metallic internal components for the measurement and transmission of volume flow for inert and corrosive liquids.
The flow transmitter picks up the entire volumetric flow and is therefore insensitive even in the event of an uneven flow profile within a cross-section.
There is no need to adhere to a special mounting position or other installation parameters. A mounting distance of 5 times DN on the inlet and outlet side is sufficient.
Components coming into contact with the medium are made of PVDF, with the shaft and bearings in a ceramic material. The housing is made of PVC.
The electronic evaluation system including the sensor is mechanically attached to the turbine housing by means of stainless steel screws.
Rotation of the turbine is picked off inductively, with the speed of the rotor proportional to flow.
The turbine can be quickly, reliably and simply mounted and removed by means of a union with DIN bushes.
Type 3020
Emergency Power Supply Unit
The 1570 E-Module provides an emergency power supply for direct current actuators.
In the case of loss of mains supply, the E-Module supplies power to the connected d.c. actuator by means of integral rechargeable battery.
In normal operation the battery is held on trickle charge from the main voltage.
The required final position of the actuated unit on loss of mains power can be programmed by means of a selector switch.
The setting of the switch can be sealed against unauthorized interference by a transparent cover over the switch lever.
LED indicators built into the unit show whether the mains supply (yellow LED) or the emergency supply (red LED) is in use.
Type 1570
Emergency power supply unit built into a universal compatible plastic housing, designed for incorporation in a control panel or direct mounting onto the corresponding GEMÜ actuator.
Example:
Type 423 + 1570
Voltage: 110, 220 V/50-60Hz
Permissible voltage deviation: ± 10%
Power consumption: 35 VA
Output voltage: 20 V d.c. unsmoothed
Output current: 1.4 A
Input fusing: M 1.6/250 V
Weight: 970 g
Cable gland: PG 13.5
3-point Controller 1286 & 1289
The E-Module type series 1286 and 1289 is for the manual or automatic setting or control of motorized valves, hence for GEMÜ type series 413/418, 613/618 and 693/698.
The valve adjustment "open" and "closed" is initiated by a relay. This energizes the valve actuator until the differences between the actual and the required valve setting is less than the control hysteresis, i.e. it readjusts the valve position.
Over the whole of the control range, switching points are adjustable as minimum and maximum values by means of a potentiometer. These points are indicated by LED’s and the presence of the supply voltage is also indicated by a mains LED.
3-point Controller 1281 & 1284
The E-Module type series 1281 and 1284 is for the manual or automatic setting or control of motorized valves, hence for GEMÜ type series 413/418, 613/618 and 693/698.
The valve adjustment "open" and "closed" is initiated by a relay. This energizes the valve actuator until the differences between the actual and the required valve setting is less than the control hysteresis, i.e. it readjusts the valve position.
Over the whole of the control range, switching points are adjustable as minimum and maximum values by means of a potentiometer. These points are indicated by LED’s and the presence of the supply voltage is also indicated by a mains LED
Isolating Switch Amplifiers
The type 1520 and 1521 isolating switch amplifiers are suitable for the following applications:
- Overload protection for light duty switches
- Mains voltage isolating component for main circuits and also for control circuits
- Switch position indicators
When the isolating switch amplifier is used, reed switches and other light duty switches will be protected against overloads since they will then not have to deal with currents above their rating. There is a danger of overload, with sparking and high currents caused by self-inductance voltages when breaking inductive loads such as power relays, solenoid valves and motors.
Both the control circuits are galvanically separated from the mains so that, if an earth fault occurs, no high voltages will appear on the installation.
These E-Modules are used in conjunction with GEMÜ type series 1251-1257 limit switches or GEMÜ type series 1211, 1214 and 1232 position indicators.
Type 1520
Type 1520/000/Z 02
Desk or panel mounting, 2 relays
1 x Min. (red LED); 1 x Max. (red LED); 1 x mains (yellow LED)
Type 1520/000/Z 04
Desk or panel mounting, 4 relays
2 x Min. (red LED); 2 x Max. (red LED); 1 x mains (yellow LED)
Type 1521
Type 1521/000/Z 02
Eurocard with 31 pole terminal block to DIN 41617 for 19" or 24" rack; 2 relays
1 x Min. (red LED); 1 x Max. (red LED); 1 x mains (yellow LED)
Type 1521/000/Z 04
Eurocard with 31 pole terminal block to DIN 41617 for 19" or 24" rack; 4 relays
2 x Min. (red LED); 2 x Max. (red LED); 1 x mains (yellow LED)
Solenoid Valves
Types 320, 322, 324
Directly controlled 3/2 way plastic solenoid valve for inert gases, with emergency manual operator. Due to its low power consumption it can be controlled by computers. Control functions are either normally open or normally closed.
The uniform basic construction of the three types in the series 320, 322, and 324 makes many applications possible without special additional components.
The valve, consisting of a solenoid system with a plastic cover and a valve body is very easy to dismantle so that the parts can be replaced separately. In addition to automatic operation, the valve can be opened or closed manually. Threaded inserts in the valve body provide an additional mounting facility for panels and standard tracks. The various possibilities for connection provide optimal installation conditions.
Type 320
Connections: threaded sockets, straight through configuration, suitable for single valve applications.
Type 322
Connections: threaded sockets, inlet and outlet arranged at an angle of 900 suitable for battery mounting. May also be used as a single valve.
Type 324
Connections: threaded sockets, inlet and outlet arranged at an angle of 900 suitable for direct mounting on process valve by hollow screw with 1/4" or 1/8" BSP thread.
Types 332/334
The valve consists of an epoxy encapsulated solenoid and a plastic body and can easily be adapted for battery mounting (all necessary parts are included: mounting clips, o-ring, threaded plug). Type 334 can be directly mounted to the valve actuator by means of a hollow bolt. Threaded inserts in the valve body provide additional mounting points.
The solenoid system is hermetically separated from the working medium. The central fastening nut enables the solenoid to be replaced without interrupting the flow. A standard plug is supplied with each valve.
The valve has a manual override facility.
Type 332
Type 334
Pneumatically Operated
| Type 312 (Globe valve)
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Type 314 (Globe valve)
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| Type 512 (Globe valve)
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Type 514 (Angle seat valve)
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| Type 540 (Angle seat valve) |
Type 542 (Globe valve) |
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| Type 544 (Angle seat valve) |
Type 554 (Angle seat valve) |
Type 507
Manually operated 2/2 way metal valve with straight-through body for fluid or gaseous media. Suitable for use at high operating temperatures.
The proven angle seat principle, the ergonomic design of the handwheel in temperature resistant plastic, and the use of stainless steel ensure reliable operation of the valve even at high temperatures.
The gland packing is manufactured as standard using chemically and thermally resistant Teflon fiber sealing rings. For operating temperatures of over 180° C, and when maximum sterility is required, a stainless steel bellow is optionally available for this valve.
Advantages
- High flow capability due to angle seat
- Suitable for extreme operating temperatures
- Autoclave capability as standard
- Ergonomically designed handwheel for secure grip
- Reduced risk of injury at high operating temperatures due to handwheel made of temperature resistant plastic
Technical Information
| Nominal Size (mm) |
Body Configuration | Operating Pressure | Kv value (m3/h) |
| 15 20 25 32 40 50 |
Standard D= straight through
on request |
25 25 25 25 25 25 |
5.4 9.0 15.2 23.0 41.0 71.0 |
Angle Seat & Globe Valves
If we consider the relative surface inside a globe valve which is subjected to pressure, it becomes clear that this functional principle is particularly suited for use with high operating pressures. It is generally known that force is the result of pressure times surface area. If the flow direction is changed in a globe valve, the force ratio is altered in the opposite way than is the case in the butterfly, ball or diaphragm valve.
This is important in as far as it can be used to influence an unfavorable closing and operating pressure force situation. In the case of electromagnetically actuated globe valves, the flow direction must always be effected with the disc due to their low closing forces. Sealing is effected with the aid of a wide variety of sealing materials, but a so-called "steel on steel" seal is also possible. This involves both a steel globe and a steel plate, which are so precisely machined that a complete seal is achieved under the closing force of the actuation system. The spindle is normally sealed using shaped plastic sealing rings which act, depending on their installation and pretension direction, as pressure, vacuum, or combination seals.
When a high level of temperature resistance is necessary, this type of plastic seal is replaced by a metal bellow. This results in temperature resistance of at least +300° C. Some manufacturers offer variations resistant to even higher temperatures.
However, insertion of a metal bellow serves to restrict the stroke. When determining the volumetric flow (KV value), therefore, attention should always be paid to select the next highest nominal width.
In a globe valve, the medium is subjected to marked deflection. This can be improved by using an angle seat globe.
Globe valves are found in applications ranging from the smallest nominal widths up to 150 mm (6") and even higher involving medium to high operating pressures and temperatures. Fitted with a relatively "hard" seal and due to the rigorous medium guidance, globe valves are usually insensitive to soiling. This functional principle, however, should be used with caution where abrasive media are being transported.
The control properties can be positively influenced by the relatively long stroke, the shape of the globe and also the use of a control taper instead of a disc to the extent that optimum control characteristics can be achieved. The globe valve can therefore be designated the standard control valve.
Typical Applications:
- Water treatment
- Installation construction
- Irrigation systems
- Inert and corrosive liquids and gases