Original inventor of M ü ller Co ax AG coaxial valve

2.4 High pressure valves (KB, A 45, VMK-H series)

High pressure applications require valves to have extremely high strength. The KB 15 series (DN 2-8) adopts a direct acting type, with a single coil operating pressure of up to 300 bar and a double coil operating pressure of up to 400 bar. The A 45 series (DN 2-6) has a maximum pressure of 130 bar. The externally controlled VMK-H series (DN 15-50) has a maximum pressure of 200 bar, and the valve body is made of galvanized steel or stainless steel. For ultra-high pressure of 500 bar, the PCD-H series (DN 10-15) and KBS Ex explosion-proof valve (DN 1.5-3) can meet the requirements.

2.5 Certified valves (DVGW, ATEX, T Ü V)

DVGW certification: compliant with DIN 3394 part 1, used for combustible gases (G260), medium temperature -15 ° C to+80 ° C, and maximum pressure PN 40. MK/FK 15 DVGW Ex can be used for explosion-proof zones 2 and 22 (ATEX).

ATEX certification: The valve body is marked with II 2 G Exe me II T4 and II 2 D IP65 T130 ° C, suitable for potentially explosive environments. The maximum medium temperature for KB 15 Ex and MK/FK series Ex versions is 40-70 ° C.

T Ü V certification: Complies with DIN EN ISO 23553-1 and E DIN 32725 for liquid fuels (such as fuel oil), with a maximum medium temperature of 140 ° C.

2.6 Control Valve (Pressure Regulation and Proportional Control)

Coaxial valves are not only used for switch control, but can also integrate pressure regulation functions:

HPB series pressure limiting valve: manual stepless adjustment, achieving low-pressure circulation mode through a 3/2-way pilot valve. Pressure regulation range 10-200 bar, DN 8-65.

SPB series proportional pressure limiting valve: It achieves stepless pressure regulation through a 0-10V control signal, and the pilot valve is a proportional valve. DN 8～65， The maximum pressure range is 200 bar.

HPI/HPP series pressure reducing valve: manually adjustable, DN 8～32， The pressure range is 5 to 100 bar.

SPP series proportional pressure control valve: 3/2-way, used for closed-loop pressure control, DN 15， Pressure range of 5 to 100 bar.

2.7 Special valves

Develop for specific industrial needs:

V2 type high temperature valve: used for hot gas filtration and gasification processes, with a maximum medium temperature of 400 ° C, and sealed with graphite or metal bellows (1.4571). DN 15～100， Pressure PN 64.

LVP 06 High Pressure Valve: Used for gas filling and petrochemical processes, with pressures up to 500 bar and DN 6.

PCB-1 10: Used for adhesive and coolant supply, with external sealed bellows that can withstand viscous and particulate media.

PLB 05: Used for bonding laminated timber beams with corrugated pipe sealing technology.

IV series vacuum valve: pulse type bistable design, used for vacuum engineering (maximum vacuum degree of 98%), DN 20～32。

Modular and manifold installation

For systems that require centralized control of multiple valves, M ü ller Co ax provides a manifold solution. For example, models such as CFM 08, MCF 08, VMK 10-32 can be installed on aluminum or stainless steel modules, supporting 2 to 8 workstations and even expandable to more. The manifold integrates a common flow channel inside, reducing pipeline connections and leakage points. Segment module design allows users to freely combine according to their needs.

Green Series: Intelligent Control with 80% Energy Efficiency

M ü ller Co ax has launched the Green Line series based on the standard MK/FK series, with a patented electronic control system that can reduce the energy consumption of direct acting valves by up to 80%. This series has the following characteristics:

Adjustable damping mode (on/off) to eliminate water hammer phenomenon.

Integrated optical and electrical position indicator (on/off).

The energy of the fully automatic magnet decreases while the electromagnet remains in a cold state.

Spring reset ensures power-off safety.

This significantly reduces heating and energy consumption for valves that require prolonged opening or closing.

Interpretation of Technical Parameters

5.1 Kv value (flow coefficient)

The Kv value is defined as the flow rate (m ³/h) of water passing through a valve at 5-30 ° C under a pressure difference of 1 bar. The Kv value of coaxial valves is related to their diameter and structure. For example:

DN 10: Kv ≈ 2.5～3.0 m³/h

DN 15: Kv ≈ 4.8～6.0 m³/h

DN 25: Kv ≈ 11.2～13.3 m³/h

DN 50: Kv ≈ 28.2～43.0 m³/h

DN 250: Kv ≈ 650 m³/h

5.2 Switching time

The opening and closing time of direct acting valves (such as MK 10) is about 25 ms; the opening and closing time of external control valves (such as VMK 15) can be adjusted within the range of 50-3000 ms to meet different hydraulic impact requirements. The fast switch (30 ms) is suitable for precise measurement, while the slow switch (3000 ms) is used to reduce water hammer.

5.3 Range of work pressure

Coaxial valves can cover from full vacuum (<10 ⁻⁶ mbar · l · s ⁻¹ leakage rate) to 500 bar. For high pressure, double coil operation or external pilot control is usually used.

5.4 Temperature Range

Standard sealing (NBR) is suitable for -20 to+80 ° C; FPM (fluororubber) can be used for -20 to+160 ° C; PTFE (polytetrafluoroethylene) can be used for -20 to+200 ° C. The special high-temperature version (V2 type) uses graphite or metal bellows sealing, and the medium temperature can reach 400 ° C. The low-temperature version can be customized up to -196 ° C.