PN16
BURKERT 20022707 is a servo-assisted 2/2-way diaphragm solenoid valve belonging to the Type 6281 EV product family, configured with circuit function A (normally closed, inlet port 1 P/NC). Built with a precision-cast 1.4408 (CF8M) stainless steel body and G 3/4 internal threaded process ports, this unit provides fluid shut-off and control for neutral and slightly aggressive media across a differential pressure range of 0.2 bar to 16 bar. The assembly integrates an epoxy solenoid coil rated for 24 V DC operation and resilient FKM (fluor rubber) seals, permitting continuous media handling from 0 °C up to +120 °C at an ambient ceiling of +55 °C.
Operating via internal servo assistance, Type 6281 requires a minimum differential pressure of 0.2 bar to initiate movement, with 0.5 bar required to open the full valve cross-section. The centrally screwed coil system delivers high vibration resistance, while the internal damped geometry ensures quiet closing characteristics to protect adjoining piping systems from hydraulic water hammer shocks.
Differential Pressure Prerequisite
Type 6281 is a servo-assisted diaphragm valve. A minimum differential pressure of 0.2 bar between inlet and outlet is mandatory for valve switching, and a differential pressure of at least 0.5 bar is required to open the complete internal cross-section.
Technical Data and Operational Limits
Specific technical parameters for BURKERT article 20022707 within the Type 6281 range:
| Parameter | Specification |
|---|---|
| Article Number | 20022707 |
| Valve Type | 6281 EV |
| Circuit Function | A (2/2-way, normally closed) |
| Orifice Size (DN) | 20 mm (3/4") |
| Port Connection | G 3/4 internal thread |
| Kv Value (Water) | 8.5 m³/h |
| Gas Flow Rate (QNn) | 9,100 l/min |
| Pilot Control Orifice | 1.3 mm |
| Operating Pressure Range | 0.2 bar to 16 bar (PN 16) |
| Operating Voltage | 24 V DC (±10% tolerance) |
| Power Consumption (Coil Size 32 mm) | 9.5 W (cold), 8 W (warm) |
| Seal Material | FKM (Fluor rubber) |
| Medium Temperature Range | 0 °C to +120 °C (epoxy coil) |
| Maximum Ambient Temperature | +55 °C |
| Permissible Fluid Viscosity | Up to 21 mm²/s |
| Switching Times (at 6 bar, +20 °C) | Opening: 0.1–1.5 s; Closing: 0.2–4 s |
| Installation Length | 80 mm |
| Valve Weight | 0.86 kg |
| Electrical Connection Type | Form A plug pattern per DIN EN 175301-803 |
| Protection Class | IP65 (with assembled cable plug) |
| Manual Override | None |
Material Specifications and Cross-Section
| Item No. | Component | Material |
|---|---|---|
| 1 | Coil | Epoxy (Class H insulation) |
| 2 | Stopper | Stainless steel 1.4113 |
| 3 | Shading ring | Silver (Ag, on stainless steel body versions) |
| 4 | Magnetic core | Stainless steel 1.4113 |
| 5 | O-ring | FKM |
| 6 | Core seal | FKM |
| 7 | Spring | Stainless steel 1.4310 |
| 8 | O-ring | FKM |
| 9 | Diaphragm | FKM |
| 10 | Diaphragm holder | PPS-GF40 |
| 11 | Valve body | Stainless steel 1.4408 (CF8M) |
Dimensional Data
The threaded version of Type 6281 in DN 20 adheres to standardized housing and coil envelope dimensions. Dimensions F1 and G1 correspond directly to G internal thread profiles:
| DN | Port G | A [mm] | B [mm] | C [mm] | D [mm] | E [mm] | F1 [mm] | G1 | L [mm] | SW [mm] | N [mm] |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 10 | G 1/4 | 83.6 | 94.6 | 32 | 44 | 22 | 12 | G 1/4 | 50 | 22 | — |
| 10 | G 3/8 | 83.6 | 94.6 | 32 | 44 | 22 | 12 | G 3/8 | 50 | 22 | — |
| 10 | G 1/2 | 85.6 | 99.1 | 32 | 44 | 24.5 | 14 | G 1/2 | 55 | 27 | — |
| 13 | G 1/2 | 91.1 | 104.6 | 42 | 54.5 | 32.5 | 14 | G 1/2 | 65 | 27 | — |
| 13 | G 3/4 | 93.1 | 109.1 | 42 | 54.5 | 32.5 | 16 | G 3/4 | 65 | 32 | — |
| 20 (20022707) | G 3/4 | 99.6 | 115.6 | 60 | 74 | 37 | 16 | G 3/4 | 80 | 32 | 10 |
| 20 | G 1 | 102.1 | 122.6 | 60 | 74 | 37.5 | 18 | G 1 | 80 | 41 | 10 |
| 25 | G 1 | 106.6 | 127.1 | 70 | 85 | 46 | 18 | G 1 | 95 | 41 | 15 |
| 25 | G 1 1/4 | 111.6 | 136.6 | 70 | 85 | 46 | 20 | G 1 1/4 | 95 | 50 | 15 |
| 40 | G 1 1/2 | 125.6 | 155.6 | 99 | 114 | 61 | 22 | G 1 1/2 | 126 | 60 | 23 |
| 40 | G 2 | 131.6 | 166.6 | 99 | 114 | 64 | 24 | G 2 | 132 | 70 | 23 |
| 50 | G 2 | 119.9 | 154.9 | 115 | 132 | 82 | 24 | G 2 | 164 | 70 | 37 |
Solenoid coil dimensions by size category:
| Coil Size | Width H [mm] | Dimension J [mm] | Dimension K [mm] | Dimension M [mm] | Dimension O [mm] |
|---|---|---|---|---|---|
| 5 (32 mm) | 32 | 20.5 | 45 | 41 | 3.4 |
| 6 (40 mm) | 40 | 23.5 | 51 | 41.4 | 3.8 |
Electrical Characteristics and Power Consumption
Standard solenoid coils within Type 6281 operate at 100% continuous duty cycle (100% ED). Article 20022707 utilizes the 32 mm width direct current (DC) coil assembly.
| Circuit Function | Orifice DN [mm] | Coil Size [mm] | AC Inrush [VA] | AC Hold [VA] | AC Hold [W] | DC Cold Power [W] | DC Warm Power [W] |
|---|---|---|---|---|---|---|---|
| A | 10–50 | 32 | 24 | 14 | 8 | 9.5 | 8 |
| A | 10–50 | 32 | 24 | 16 | 7 | 9.5 | 8 |
Upstream Filtration Recommendation
Foreign particles and pipe scale can obstruct the pilot control bore or prevent proper seating of the core seal. Always flush pipelines prior to installation and install a strainer or dirt trap with mesh size ≤ 500 µm upstream of the valve inlet.
Installation, Operation, and Solenoid Assembly
Installation requires attention to fluid flow direction and correct electrical conductor bonding:
- Check the body marking: the arrow on the valve body indicates the required direction of medium flow.
- Do not use the solenoid coil as a lever arm when threading pipes into the body. Secure the body with an open-end wrench on the provided flat wrench faces (SW 32 mm for DN 20).
- The valve can be mounted in any orientation; orientation with the solenoid actuator upright is recommended.
- When fitting the solenoid coil over the core guide tube, verify that the O-ring (3) and anti-twist device (4) are positioned accurately.
- Fasten the central retaining nut (1) using an open-end wrench. Observe the mandatory tightening torque:
| Solenoid Type | Solenoid Width | Tightening Torque |
|---|---|---|
| AC10 | 32 mm or 40 mm | 5 Nm |
| AC19 | 42 mm | 10 Nm |
Solenoid Overheating Precaution
Never connect electrical power to the solenoid coil while it is detached from the valve core guide tube. Energizing a detached coil without magnetic core opposition causes immediate thermal overload and coil destruction.
Spare Parts and Compatible Accessories
Original replacement components for Type 6281 EV are ordered as designated sets using the identification number 20022707 along with the set category:
- SET 1: Magnetic core assembly with springs and seals
- SET 3: Complete diaphragm sub-assembly with holder and O-rings
- SET 7: Comprehensive overhaul seal kit
Cable plugs are not included in the standard scope of delivery and must be ordered separately according to DIN EN 175301-803 Form A:
| Accessory Description | Operating Voltage | Article No. |
|---|---|---|
| Type 2518 Cable Plug without circuitry | 0–250 V AC/DC | 314802 |
| Type 2518 Cable Plug with LED indicator | 12–24 V AC/DC | 314812 |
| Type 2518 Cable Plug with LED and Varistor | 12–24 V AC/DC | 314820 |
| Type 2518 Cable Plug with Rectifier, LED, and Varistor | 12–24 V AC/DC | 314816 |
| Type 2509 Standard Cable Plug without circuitry | 0–250 V AC/DC | 137943 |
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