BURKERT 20037311 Type 0121 is a direct-acting, media-separated pivoted armature solenoid valve designed for controlling, shutting off, and dosing neutral and aggressive media. The solenoid actuator and the medium chamber are separated by a diaphragm system, making the valve suitable for critical media such as aggressive acids and lyes. The solenoid coils are molded with a chemically resistant epoxy. This specific 20037311 configuration features a PVDF body, EPDM seals, a G 3/8 internal thread connection, and operates as a 2/2-way normally open (NO) valve. It includes a manual override for start-up and testing, and utilizes Kick and Drop coil technology for energy reduction.

General Technical Data

Property	Specification
Orifice	DN 2 to DN 8 (SKU 20037311 is 6.00 mm)
Thermal insulation class	Epoxy coil class H
Duty cycle (Plastic body)	10% duty cycle (10 min); 100% continuous operation for variant with high-performance electronic
Switching frequency	Max. 100/min with AC; Max. 10/min for UC (high-performance electronic)
Voltage tolerance	±10%
Viscosity	Max. 37 mm²/s
Degree of protection	IP65 in accordance with DIN EN 60529/IEC 60529 with correctly connected cable plug
Installation	As required, preferably with actuator upright

Material Specifications

The coil system is separated from the medium by a diaphragm. The sectional drawing below illustrates the standard variant construction.

No.	Element	Material
1	Coil	Epoxy
2	O-ring	FKM, FFKM, EPDM
3	Toggle pin	PTFE
4	Seal	FKM, FFKM, EPDM
5	Seat	PTFE, PVC, Stainless steel 1.4401 (PVDF for 20037311)
6	Valve body	PTFE, PVC, Stainless steel 1.4401 (PVDF for 20037311)

Dimensions

The following dimensions apply to the standard variant with threaded connections.

Body material	D	B	E	F
Stainless steel	G 1/4	89	32	76
PVC / PTFE / PVDF	G 3/8	91	35	65 (PVC/PVDF) / 76 (PTFE)

Performance Specifications

The pressure range and flow rate depend on the circuit function and orifice size. The values below represent the standard variant.

Circuit function	DN	Kv value water [m³/h]	Pressure range AC [bar]	Pressure range DC [bar]
A / F	2	0.1	0...6	0...3
	4	0.3	0...4	0...2
	6	0.6	0...2	0...1
	8	1.0	0...1	0...0.8
B (Normally Open)	2	0.1	0...6	0...3
	4	0.3	0...4	0...2
	6	0.6	0...2	0...1
	8	1.0	0...1	0...0.5

Installation Recommendation

For safe operation of the solenoid valve, a dirt trap (≤ 500 µm) must be installed before the valve inlet. When manual override is locked, the valve cannot be electrically actuated.

WARNING

Do not use the coil as a lever arm during installation. Hold the device on the body using the appropriate open-ended spanner and screw into the pipeline using PTFE tape as a seal material.