330,331 series solenoid valve is mainly used for coffeemachine and beverage industry with high standard of foodsafetyapproval.The solenoid valve is in 2-and 3-wayscategories. This series provided different connection andvoltage to fulfill different types of demand with differentinternational certification standards.
Core Material Properties
- Body Material
Food-grade POM (Polyoxymethylene), PP (Polypropylene), or PVDF (Polyvinylidene Fluoride), compliant with FDA 21 standards for food contact safety.
- Material Characteristics
- Corrosion Resistance: Resists organic acids in coffee (e.g., citric acid), detergents, and moisture, ideal for daily cleaning.
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- Temperature Tolerance:
- POM: -40°C to +100°C (suitable for hot water up to 95°C).
- PP: -30°C to +80°C (suitable for cold/warm water).
- PVDF: -40°C to +150°C ( systems up to 120°C).
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- Lightweight & Impact Resistance: 50% lighter than stainless steel, with high tensile strength (POM: ≥62 MPa) for durable mechanical stress.
Technical Parameters
1. Flow & Pressure Specifications
- Orifice Size: 1/8, compatible with coffee machine water lines (e.g., 1/4" quick-connect fittings).
- Flow Rate: 0.2-5 L/min, precision control for espresso extraction (e.g., 30mL in 25s) or drip coffee brewing.
- Working Pressure:
- Low-pressure: 0.05-0.6 MPa (0.5-6 bar) for household drip machines.
- Medium-pressure: 0.6-1.0 MPa (6-10 bar) for semi-automatic espresso machines.
- Pressure Resistance: Up to 1.5 MPa burst pressure to prevent system failure.
2. Electrical & Dynamic Parameters
- Power Supply: AC 110V/220V, DC 12V/24V (low power consumption: 3-15W).
- Response Time: ≤80ms (opening/closing), ensuring precise water flow timing for coffee extraction.
- Coil Protection: IP65 waterproof rating, with heat-resistant epoxy encapsulation for moisture-proofing.
Structural & Functional Features
1. Valve Types & Operation
| Type |
Operation Principle |
Application Scenarios |
| Normally Closed |
Closes when power off, opens when on |
Water inlet control (prevents leakage when off) |
| Normally Open |
Opens when power off, closes when on |
Steam release systems (e.g., milk frother standby) |
2. Sealing Design
- Seal Material: Food-grade EPDM or silicone rubber, resistant to coffee oils and temperatures up to 150°C for high-temperature steam).
- Leakage Rate: ≤0.1 mL/min under rated pressure, ensuring zero contamination.
3. Connection Types
- Threaded: G1/4", NPT 1/4" (compatible with metal pipes).
- Push-to-Connect: 6mm/8mm OD fittings for quick installation with food-grade silicone hoses.
Application & Environment
1. Media & Functionality
- Suitable Media:
- Cold/hot water (≤95°C for POM/PP, ≤120°C for PVDF).
- Low-pressure steam (≤0.8 MPa, PVDF models only).
- Key Functions:
- Quantitative water injection for capsule machines (20-120mL per cycle).
- Extraction flow control for espresso machines (precision to 0.1mL).
- Drip tray drainage or steam wand on/off switching.
2. Machine Compatibility
- Household Use: Drip coffee makers, pod machines, semi-automatic espresso machines.
- Commercial Use: Low-pressure coffee brewers, small-scale commercial espresso systems (≤9 bar).
Certifications & Compliance
- Food Contact Approvals: FDA, CE (electrical safety).
Durability & Maintenance
- Service Life: ≥500,000 cycles (POM body, normal pressure), ideal for daily use (100-300 cycles/day).
- Maintenance Design:
- Detachable valve head for easy seal replacement (reduces repair costs).
- Smooth inner surface (Ra≤1.6μm) to minimize coffee residue and scale buildup.
Sample Product Description (English)
"This food-grade POM plastic solenoid valve is engineered for household espresso machines, featuring a DN10 (3/8") orifice and 0.5-0.8 MPa working pressure. The normally closed design ensures water-tight shutdown when powered off, while the food-grade EPDM seal resists 95°C hot water and coffee oils. With IP65-rated waterproof coil and quick-connect fittings, it supports precise extraction control (e.g., 30mL in 25s) for golden ratio espresso. Certified by FDA, the valve offers 500,000+ cycle durability, perfect for daily home brewing needs."
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