SMC LVMK207-6J — LVMK20/200 Series Direct Operated 3-Port Isolated Solenoid Valve for High-Purity Fluids
2026-07-01
The SMC LVMK207-6J is a direct operated 3-port isolated solenoid valve from the LVMK20/200 series, featuring side ported piping (tube Ø3.2). Designed specifically for high-purity fluid control applications, the isolated structure uses a diaphragm to physically separate the solenoid drive section from the fluid area — eliminating metal ion leaching and armature sticking. It is widely used in water quality analyzers, blood analyzers, atmospheric pollution monitoring equipment, and other applications requiring exceptional cleanliness and reliability.
The defining feature of the LVMK20/200 series is its metal-free design — the body is made of PPS (polyphenylene sulfide) with EPDM or FKM seals, ensuring zero metal contact and zero oil contamination throughout the fluid path. The 3-port version (LVMK207) is a universal type that can function as either N.C. (normally closed) or N.O. (normally open) without additional flow adjustment, greatly simplifying circuit design.
Key Features
- Isolated Structure: Diaphragm completely separates solenoid drive from fluid area, preventing metal ion leaching and ensuring fluid purity
- Zero Leakage: Both external and internal leakage are zero (tested at water pressure), suitable for demanding liquid shut-off applications
- Minimal Dead Space: Extremely low internal dead volume for easy cleaning and prevention of residual liquid accumulation
- Direct Operated Poppet Design: No minimum operating pressure differential required — works stably from vacuum to 0.2 MPa
- Fast Response: ≤16 ms switching time (at pneumatic pressure, 25°C), ideal for high-speed switching applications
- Metal-Free Fluid Contact: PPS body, EPDM/FKM seals — zero metal, zero grease throughout
- Low Power Consumption: Rated 3 W (0.125 A at 24 VDC), suitable for continuous duty
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | LVMK207-6J |
| Series | LVMK20/200 |
| Number of Ports | 3-port (Universal) |
| Valve Function | N.C. / Universal (switchable) |
| Valve Construction | Direct operated poppet |
| Piping | Side ported (tube Ø3.2 mm) |
| Applicable Fluids | Air, Water, Deionized water, Diluent, Cleaning fluid |
| Operating Pressure Range | -90 kPa to 0.2 MPa |
| Proof Pressure | 0.3 MPa |
| Effective Orifice | Ø2 mm equivalent |
| Response Time | ≤16 ms (at pneumatic pressure, 25°C) |
| Cv (Air) | 0.065 |
| Kv (Water) | 0.055 |
| Leakage | Zero (external & internal, at water pressure) |
| Rated Voltage | 24 VDC |
| Allowable Voltage Fluctuation | ±10% of rated voltage |
| Power Consumption | 3 W (0.125 A at 24 VDC) |
| Coil Insulation Class | Class B |
| Coil Switching Noise | ≤70 dB(A) |
| Enclosure Rating | IP40 equivalent |
| Ambient Temperature | 5 to 50°C (no condensation) |
| Fluid Temperature | 5 to 50°C |
| Mounting Orientation | Free (vertical with coil on top recommended for residual liquid drainage) |
| Body Material | PPS (Polyphenylene Sulfide) |
| Seal Material | EPDM (FKM optional) |
| Lead Wire | 300 mm (6J type) |
| Weight | Approx. 76 g (300 mm leads) |
Model Number Naming Convention
LVMK {{ valve_type }} {{ port_number }} — {{ voltage_code }} {{ lead_length }}
Example: LVMK 207 — 6 J
│ │ │ └── Lead Length: J = 300 mm
│ │ └────── Voltage: 6 = 24 VDC
│ └────────────── Body Type + Piping: 207 = 3-port Universal, Side Ported
└─────────────────── Series
LVMK20/200 Series Model Variants
| Model | Ports | Function | Piping |
|---|---|---|---|
| LVMK21 | 2 | N.C. | Bottom ported |
| LVMK27 | 2 | N.C. | Side ported |
| LVMK207 | 3 | Universal | Side ported |
| LVMK202 | 3 | Universal | Bottom ported |
| LVMK23 | 2 | N.C. | Base mounted |
| LVMK205 | 3 | Universal | Base mounted |
Voltage & Lead Wire Options
| Voltage Code | Rated Voltage | Lead Code | Lead Length |
|---|---|---|---|
| 5 | 12 VDC | J | 300 mm |
| 6 | 24 VDC | K | 600 mm |
| L | 1,000 mm |
Application Industries
- Environmental Monitoring: Atmospheric pollution analyzers, water quality monitoring equipment (COD/ammonia nitrogen/total phosphorus analyzers) for reagent switching and sample metering
- Medical / Clinical Diagnostics: Blood analyzers, biochemistry analyzers, urine analyzers — microfluidic control in diagnostic instruments
- Semiconductor Manufacturing: Ultrapure water systems, cleaning fluid distribution, etchant switching — processes requiring minimal metal ion leaching
- Pharmaceutical Industry: Drug testing equipment, laboratory automation — reagent and diluent path switching
- Food Safety Testing: Solution dispensing and flow path switching in food safety analysis instruments
Installation & Usage Notes
- Residual Liquid Drainage: Mount with coil facing upward (vertical) to allow gravity-assisted drainage and minimize dead volume
- Tubing Connection: Use Ø3.2 mm tubing (side ported), ensure proper insertion depth and secure locking
- Electrical Connection: 24 VDC drive, observe polarity (red = positive, black = negative), 300 mm lead wire length
- Fluid Compatibility: Verify chemical compatibility of fluid with seal material (EPDM/FKM) to prevent swelling or degradation
- Pulse Drive Recommended: Use pulse drive to reduce coil heating; consider ambient heat dissipation for continuous duty
- Pre-Filtration: While designed as maintenance-free, install an inline filter upstream when handling particulate-containing fluids
Series Comparison
| Feature | LVMK20/200 Series | LVM10/100 Series |
|---|---|---|
| Operation | Direct operated | Direct operated |
| Isolated Structure | Yes (diaphragm) | No (standard solenoid) |
| Metal Contact with Fluid | None | Yes (standard) |
| Applicable Fluids | Air, Water, DI water, Reagents | Air |
| Primary Application | Analytical instruments, Medical devices | General industrial automation |
Frequently Asked Questions
Q: Can LVMK207-6J be used in vacuum lines?
Yes. The operating pressure range is -90 kPa to 0.2 MPa, allowing normal switching under vacuum conditions. Suitable for vacuum sampling and negative-pressure liquid drainage applications.
Q: Will the valve spool get stuck? How can this be prevented?
The LVMK20/200 series’ isolation diaphragm design significantly reduces sticking risk — the solenoid drive section is physically separated from the fluid area, preventing fluid impurities from entering the drive chamber. For fluids containing large particulates, install an inline filter upstream of the valve.
Q: Can it handle acid or alkaline solutions?
Depends on the seal material. Standard EPDM seals are suitable for weak acids/bases, water, and deionized water. For stronger chemical resistance, choose FKM (fluoroelastomer) seal models. Always verify fluid compatibility with PPS body material and seal material before use.
Q: What is the expected service life of this valve?
SMC does not publish a specific mechanical life rating for this series. With its direct-operated poppet design (no sliding friction pairs), expected life can exceed tens of millions of cycles under clean fluid conditions. Actual life is influenced by fluid purity, operating frequency, and ambient temperature.
Data source: SMC Official Product Catalog (smc.com.cn) — LVMK20/200 Series. Content is for reference only; refer to the latest SMC official datasheet for precise specifications. Product images are copyright SMC Corporation.