BURKERT 465020 (Type 5420) is a pilot-controlled 4/2-way seat valve equipped with servo-diaphragms for pneumatic systems. Configured in circuit function G (normally open), the valve routes inlet port 1 (P) to working port 2 (B) while exhausting working port 4 (A) through exhaust port 3 (R) when de-energized. The unit features internal NPT 1/8 threaded connections, an aluminium working port interface, a polyamide (PA) valve body, and an integrated manual override. A minimum differential pressure of 2.5 bar is required for switching across the operating pressure range of 2.5 to 10 bar.

Design and Operating Principle

Type 5420 operates as a poppet seat valve piloted via integrated servo-diaphragms. Switching actuation is electrical, paired with a hybrid return system combining a pneumatic spring and a mechanical spring. The push-over solenoid coil utilizes an AC10 coil system with a 32 mm width profile, isolated from fluid media. Exhaust air flow can be throttled directly on the valve or manifold.

• Fluidic architecture: 4 fluid ports, 2 distinct switching positions.
• Circuit function G: Unactuated state connects port 1 (P) to port 2 (B), and port 4 (A) to port 3 (R).
• Latching variant: 2-conductor version with external pole reversal.
• Manual operation: Integrated manual override allows manual valve cycling during setup and commissioning.
• Body construction: PA body with aluminium working port inserts positioned opposite the supply side.

Technical Data and Operating Limits

Parameter	Specification
Orifice size DN	3.0 mm (main valve), 1.1 mm (pilot control)
Flow rate (QNn air)	150 l/min (air at +20 °C, 6 bar inlet, 1 bar Δp)
Operating pressure	2.5 to 10 bar
Minimum switching differential	2.5 bar
Nominal voltage	24 V DC (tolerance ±10%)
Electrical power consumption	2 W
Operating medium	Neutral gases, lubricated or dry compressed air
Compressed air quality	ISO 8573-1:2010, Class 7.4.4
Medium temperature	-10 °C to +60 °C
Ambient temperature	-10 °C to +55 °C
Response time opening	30 ms (pressure build-up 0 to 90%)
Response time closing	20 ms (pressure decay 100 to 10%)
Duty cycle	100% continuous operation
Valve weight	Approx. 0.4 kg

Compressed Air Dew Point

To prevent condensation and freezing of expanding compressed air, the pressure dew point must remain at least 10 K lower than the operating medium temperature.

Operating Pressure Limit

A differential pressure of at least 2.5 bar must be maintained across the valve. Operating below 2.5 bar differential will prevent full poppet switching.

Dimensions and Installation

Type 5420 mounts either as a stand-alone inline valve or grouped onto two-channel pneumatic supply manifolds. Valve mounting is accomplished via four M4 x 8 mm tapped holes located on the underside of the body. Station width when banked is 33 mm per unit.

• Stand-alone mounting: Connect supply line to port 1 (P), exhaust to port 3 (R), and actuator lines to ports 2 (B) and 4 (A).
• Manifold mounting: Union nuts on ports 1 and 3 are replaced by 10 x 2 mm O-rings for connection into shared supply blocks.
• Thread sealing: PTFE tape is recommended on pipe threads. Ensure tape fragments do not enter the fluid bore.

Mounting Orientation

Installation orientation is universal, but mounting with the solenoid coil upright is recommended to prevent particulate matter from settling into the core guide tube.

Electrical Connection and Wiring

Electrical connection is established via plug contacts matching Form A per DIN EN 175301-803. The terminal interface accommodates Burkert cable plug Type 2518 or Type 2509. When correctly mated with the included seal, the connection delivers IP65 ingress protection.

• Terminal screw torque: Tighten the center retaining screw on the cable plug connector to 0.5 Nm (4.4 lbf-in).
• Polarity: Follow pin designation on the plug base. For DC coils, pin assignment is indicated on the housing label.
• Earthing: Ensure the protective earth (PE) conductor is firmly connected to the ground terminal pin.

Ordering Information and Related Models

Article No.	Circuit Function	Port Connection (1 & 3)	Port Connection (2 & 4)	Voltage / Frequency	Power Consumption	QNn (Air)
465020	CF G	NPT 1/8	NPT 1/8	24 V DC	2 W	150 l/min
134622	CF G	G 1/8	G 1/8	24 V DC	2 W	200 l/min
134623	CF G	G 1/8	G 1/8	24 V 50/60 Hz	11 VA (inrush) / 6 VA	200 l/min
134625	CF G	G 1/8	G 1/8	230 V 50/60 Hz	11 VA (inrush) / 6 VA	200 l/min
134630	CF G	Hose 6/4 mm	Hose 6/4 mm	24 V DC	2 W	200 l/min
134634	CF G	Manifold flange	G 1/8	24 V DC	2 W	200 l/min
134638	CF G	Manifold flange	Flange 6/4 mm	24 V DC	2 W	200 l/min

System Accessories

Manifolds and Manifold Hardware

Stackable aluminium manifolds support centralized air supply for multiple Type 5420 stations:

Manifold Type	Total Length A (mm)	Hole Spacing B (mm)	Article No.
2-fold station	75	87	005356
3-fold station	108	120	005357
4-fold station	141	153	005372
5-fold station	174	186	005373
6-fold station	207	219	005374
8-fold station	273	285	006553

• Manifold silencer: Article no. 005424
• Blanking screw for ports 1 or 4: Article no. 005390
• Cover plate for spare station slot: Article no. 005432
• Manifold interconnecting nipple with O-rings: Article no. 005049

Cable Plugs (Form A DIN EN 175301-803)

Cable plugs are ordered separately from the valve unit:

• Type 2518 without circuitry (0...250 V AC/DC): Article no. 314802
• Type 2518 with LED (12...24 V AC/DC): Article no. 314812
• Type 2518 with LED and varistor (12...24 V AC/DC): Article no. 314820
• Type 2518 with rectifier, LED, and varistor (12...24 V AC/DC): Article no. 314816

Troubleshooting and Servicing

If the valve fails to switch during operation, verify the following mechanical and electrical checkpoints:

1. Ensure inlet air pressure provides a differential of at least 2.5 bar.
2. Confirm supply voltage matches the 24 V DC label rating within ±10%.
3. Check that the pilot orifice (1.1 mm) and pilot exhaust vent remain unblocked by particulate or excess lubricant.
4. Verify electrical continuity across the coil pins; check for short circuits or open windings.
5. Ensure core plunger moves freely; an obstructed core in AC coils will cause rapid overheating.