PN16
BURKERT Type 6518 (SKU 20000913) is a servo-assisted 3/2-way pneumatic solenoid valve designed for high flow-rate capacity and reduced power consumption. The valve width of 32 mm allows high flow rates up to 1300 l/min. These valves work without continuous air consumption and are used for the pneumatic control of double or single-acting actuators. The use of high-quality materials makes it possible to use these valves in the open air and under chemical atmospheres. The product line contains units with Ex-Approvals (Standard, Ex mb, Ex eb mb, and Ex ia variants) and NAMUR flange interfaces. With valve circuit functions C and D, safety level SIL2 can be achieved in accordance with IEC 61508, depending on the architecture of the safety device.
General Technical Data
| Product properties | Details |
|---|---|
| Dimensions | Valve width 32 mm |
| Seal Material | NBR, PUR |
| Body Material | Polyamide, reinforced glass-fibre |
| Threaded bushing | Brass (stainless steel on request) |
| Manual override | Standard |
| Orifice | DN 8...DN 9 |
| Pneumatic module | MP07 |
| Circuit function | C and D |
| Thermal insulation class | Polyamide coil class B, Epoxy coil class H |
| Compressed air quality | ISO 8573-1:2010, class 7.4.4 |
| Duty cycle | 100 % continuous operation |
| Operating medium | Neutral medium (e.g. lubricated or oil-free compressed dry air) |
| Supply connection 1, 3, 5 | Threaded G 1/4, NPT 1/4 |
| Working port 2, 4 | Threaded G 1/4, NPT 1/4 |
| Degree of protection | IP65 with cable plug |
| Installation position | As required, preferably with actuator upright |
Product Variants
Standard Variant
Type 6518 is a pilot operated 3/2-way valve (normally closed or open). The valves can be used individually or in blocks.
- Weight: 384 g (Coil size 32 mm)
- Switching time: Opening 20 ms, Closing 40 ms
- Operating voltage: 24 V DC, 24/110/230 V 50/60 Hz
- Medium temperature: -10 °C...+55 °C
- Ambient temperature: -25 °C...+55 °C
Ex mb and Ex eb mb Variant
Ex mb approval is achieved by fitting the valve with a corresponding push-over coil. The cable connection and the cable are permanently moulded to the coil.
Temperature Limits
The maximum medium temperature must never exceed the permitted temperature class (T4: +135 °C, T5: +100 °C, T6: +85 °C) minus 5 K.
- Weight: 600 g
- Switching time: Opening 20 ms, Closing 50 ms
- Operating voltage: 24/110/230 V UC
- Explosion protection: ATEX / IECEx (Ex mb IIC T* Gb, Ex mb IIIC T*** °C Db)
Ex ia Variant
The intrinsically-safe Type 6518 Ex ia valve consists of an intrinsically-safe pilot control and a pneumatic amplifier. The diaphragm-controlled valve seats work with very low friction, ensuring reliable switching of the valve, even after long shut-down periods. SKU 20000913 is an Ex ia variant.
Intrinsically Safe Operation
The valves are intended for operation at 24 V DC outputs via the intermediate switching of a corresponding intrinsically safe operating resource (isolating module or barrier).
- Weight: 580 g
- Switching time: Opening 75 ms, Closing 115 ms
- Minimum switching current: 29 mA
- Nominal resistance coil: 310 Ω
- Explosion protection: ATEX / IECEx (Ex ia IIC T6/T4 Gb, Ex ia IIIC T135 °C Db)
Circuit Functions
| Symbol | Description |
|---|---|
| C | 3/2-way solenoid valve. Servo-controlled. Normally closed. |
| D | 3/2-way solenoid valve. Servo-controlled, with manual override. Normally open. |
Dimensions
Standard variant 3/2-way valve, circuit function C and D (With plug form B or C)
(Dimensions in mm)
Product Design and Assembly
Block Assembly
Single modules or pre-assembled blocks can be ordered.
- Connection module left
- Base module 3-fold
- Intermediate module: supply connections pierced for additional pressure supply or Connection module right: supply connections closed, thus enabling multiple operating pressures in a single block
- Base module 2-fold
- Connection module right
- Supply connection: 3(R)
- Supply connection: 1(P)
- Supply connection: 5(S)
- Cover plate for 3/2-way valve (to cover unused connections)
Valve Assembly
- Pilot control
- Manual override
- Pilot pressure port
- Working port
Installation Notes
Tightening Torques
Observe the following tightening torques when screwing in the port connections:
- G1/4 and NPT1/4: Recommended 4...7 Nm, Maximum 20 Nm
- M5 (auxiliary pilot air): Recommended 1...1.2 Nm, Maximum 3 Nm
Electrical Safety
If there is no protective conductor contact between the solenoid and the body, there is a risk of electric shock. Always connect the protective conductor and check electrical continuity between solenoid and body.
