حزب 7959 (MFH-3-1/4-S) صمام الملف اللولبي

اسم المنتج الكامل: MFH-3-1/4-S, Order No.7959, Tiger Classic Series 3/2-way Normally Closed Single Solenoid صمام الملف اللولبي

⚠️ Valve body does NOT include solenoid coil; coil must be ordered separately

✅ Key Specifications

📌 Model Code Explanation

MFH: Tiger Classic series solenoid valve

3: 3/2-صمام الطريق

1/4: Main port thread G1/4

س: External pilot supply version

🛠️ Application Scenarios

Single-acting cylinder control, vacuum circuit, air blow-off/shutoff, آلات التعبئة والتغليف, machine tool pneumatic circuits, air switches for automated production lines.

External pilot: Cannot be driven directly by low-pressure vacuum. Pilot supply must be independently supplied with ≥1bar control air.

🔁 Same Series Reference (رقم الطلب)

7958: MFH-3-1/8-S (G1/8)

7959: MFH-3-1/4-S (G1/4)

7960: MFH-3-1/2-S (G1/2)

⚠️ Selection & ملاحظات الصيانة

1. Solenoid coil must be purchased separately (على سبيل المثال. MSFW series, تيار متردد 220 فولت / تيار مستمر 24 فولت). Valve body comes without coil;
2. External pilot structure, independent pilot air supply, works reliably even when main circuit is under negative pressure;
3. Poppet valve design with soft seal: excellent sealing performance, but vulnerable to wear if medium contains heavy dust;
4. Second-hand inspection focus: manual button operation, air tightness test (pressurize port 1: no output at port 2 when de-energized, air output at port 2 when energized).

حزب 7959 (MFH-3-1/4-S) حالات التطبيق

Core advantage: External pilot 3/2-way normally closed poppet valve, compatible with vacuum in main circuit, high flow rate 800L/min; independent pilot air supply via M5 port ≥1bar. This is the biggest difference from standard internal-pilot MFH valves.

قضية 1: Packaging Machine｜Single-acting Clamping Cylinder Control (الأكثر شيوعًا)

معدات: Horizontal form-fill-seal machine, vertical bagging machine, carton folding machine

حلبة: 7959 → Single-acting spring return clamping cylinder

Coil energized: Valve shifts, compressed air enters cylinder cap end, workpiece clamped;

تم إلغاء تنشيط الملف: Valve resets, cylinder chamber exhausts, spring releases workpiece.

Selection Reasons

1. G1/4 high flow, fast clamping response; detent manual button allows manual clamping test during commissioning;
2. Soft seal poppet valve, low leakage after long frequent cycling;
3. PAL rail manifold mountable, multiple valves mounted side-by-side for centralized air supply and exhaust.

ملحوظة: Pilot air shall be taken from a separate clean air source, not shared with main cylinder air supply.

قضية 2: Vacuum Pick & Place Circuit (Representative Application of This Valve)

معدات: PCB mounter, carton feeding manipulator, plastic part handling suction cup module

حلبة: Vacuum generator → 7959 valve → Vacuum suction cup

De-energized: Valve closed, suction cup disconnected from vacuum source, suction cup vented to atmosphere, workpiece released;

Energized: Valve opens, vacuum connected to suction cup, workpiece picked up.

✅ Key point: External pilot version allows vacuum in main circuit. Internal-pilot MFH cannot be directly used for vacuum circuits (negative pressure in main circuit causes unreliable shifting). This is the core value of 7959 (suffix -S).

ملحوظة: M5 pilot port must be continuously supplied with ≥1bar clean compressed air. Vacuum cannot be used as pilot supply.

قضية 3: Machine Tool｜Chip Blow-off & Workpiece Ejection

معدات: CNC lathe, machining center, stamping machine workpiece blow-off, material bin air separation

حلبة: Main air supply G1/4 → 7959 → Air nozzle

Energized: High-flow air jet blows away metal chips or eject finished workpieces out of station;

De-energized: Air supply cut off, nozzle pressure relieved.

Selection Reasons: 800L/min high flow for high intensity short pulse blowing; poppet valve tolerates minor dust for machine tool cutting environment; IP65 allows mounting outside machine cabinet.

قضية 4: ممحاة & Plastics Industry｜Single-acting Lifting/Ejection Mechanism

معدات: Injection molding machine mold ejection, rubber molding machine demolding, hot pressing tool lifting

حلبة: 7959 driving large bore single-acting spring return cylinder for mold ejection.

سمات: Die-cast aluminum housing tolerates oil contamination and elevated temperature in mold environment; valves can be assembled on manifold rail;

Safety merit: Automatic spring reset upon power loss, mold retracts automatically for safety redundancy.

قضية 5: Conveyor Line｜Pilot Control for Pneumatic Valves (Used as Pilot Valve)

معدات: Sorting conveyor, pallet stopper, large bore pneumatic shut-off valve

حلبة: PLC drives 7959; 7959 outputs pneumatic signal to actuate large-size main pneumatic valve.

سيناريو: Main valve has huge flow capacity and cannot be directly driven by small solenoid valves; 7959 serves as secondary pilot valve to provide control air signal.

المزايا: 10مللي الاستجابة السريعة, stable pilot output, suitable for 2-stage control of large pneumatic circuits.

قضية 6: التحديثية & Replacement for Legacy Equipment (Spare Part Application)

Many imported automated production lines manufactured from 1990s to 2010 adopt Tiger Classic poppet valves. Damaged MFH-3-1/4-S (7959) يمكن استبدالها مباشرة.

Industry status: This classic legacy spare part. Specified on drawings of many packaging, printing and textile machines. Supports through-hole mounting or PAL rail mounting; no hole modification required during replacement.

Common Risk Reminders Across All Cases

1. Valve body without coil, MSFW coil must be ordered separately (DC24V most popular);
2. -S = external pilot, M5 pilot port pressure ≥1bar, pilot air filtration ≥40μm; insufficient pilot pressure causes no shifting or intermittent misfiring;
3. Medium must be filtered; dust particles scratch poppet seal and cause internal leakage;
4. In vacuum applications, main circuit negative pressure cannot be used for pilot supply; independent positive pressure air source required for pilot.

Industry Summary List

ماكينات التعبئة والتغليف: Carton machine, horizontal packaging machine, heat sealer (clamping, vacuum material pick-up)

أداة الآلة & Metal Working: Chip blow-off, workpiece ejection

ممحاة & Plastics Injection: Mold single-acting ejection

Logistics Automation: Suction cup handling, sorting stopper

الطباعة & النسيج: Fabric clamping, paper stack air separation

Legacy imported equipment maintenance & استبدال (Tiger Classic valve)

Working Principle of MFH-3-1/4-S (حزب 7959)

Model breakdown: 3/2-طريق, مغلقة عادة, single-solenoid spring return, external pilot (-س) poppet solenoid valve

مهم: This is an external pilot valve. The solenoid coil only controls pilot air and does NOT directly actuate the main spool, completely different from direct-acting solenoid valves.

1. Port Definition (3/2-way Valve)

ميناء 1: Main air supply inlet (G1/4)

ميناء 2: Working output port → Connect to cylinder / suction cup / nozzle

ميناء 3: Exhaust port (main circuit exhaust)

ميناء 12: Pilot supply port M5 (external pilot dedicated, must be supplied ≥1bar clean compressed air)

ميناء 82: Pilot exhaust port M5

Definition of 3/2-way: 3 air ports, 2 working states (إلغاء تنشيط / energized)

2. Two Operating States

✅ State 1: Coil De-energized (Home Position, مغلق عادة)

1. Main poppet is pressed against main valve seat by return spring force;
2. الدائرة الرئيسية: Port1 (main supply) ↔ Port2 disconnected; Port2 ↔ Port3 (العادم) connected;
3. Pilot circuit: Pilot control chamber exhausted via port82, no pressure inside pilot chamber;
4. نتيجة:

For single-acting cylinder: Cylinder exhausts and retracts by spring;

For vacuum suction cup: Suction cup vented to atmosphere, workpiece released.

✅ State 2: Coil Energized (Shifted Position)

1. Solenoid coil pulls armature → opens small internal pilot slide valve;
2. Compressed air from external pilot supply (port12) enters control chamber of main poppet;
3. Pressure from pilot air generates thrust to overcome return spring and shift main poppet;
4. Main circuit switching: Port1 ↔ Port2 connected; Port2 ↔ Port3 exhaust port blocked;
5. نتيجة:

Compressed air flows from port1 to port2 to actuate actuators;

Vacuum circuit: Port2 connected to vacuum source, negative pressure generated at suction cup for workpiece pick-up.

After de-energization, pressure inside control chamber discharges through port82 pilot exhaust port, spring pushes main poppet back to home position, returning to normally closed state.

3. الميزة الأساسية: Principle of External Pilot (-س) (مفتاح)

Internal pilot valve: Pilot air is tapped from main supply port 1. If main circuit is under vacuum (negative pressure), no positive pressure available at port1 to generate thrust to shift poppet, cannot be used for vacuum circuits.

External pilot (-س): Pilot air is independently supplied from port12, fully isolated from main circuit (port1/2/3).

Main circuit port1 can carry compressed air or vacuum negative pressure. As long as port12 pilot supply maintains ≥1bar positive pressure, reliable valve shifting is guaranteed.

👉 This is the fundamental reason why 7959 can be used in vacuum suction cup circuits.

4. Structure Overview (Poppet Valve)

It is a poppet valve, not slide valve: Sealing is achieved by pressing rubber seal against valve seat.

المزايا: Excellent sealing performance, low leakage;

العيوب: Sensitive to dust in medium; solid particles may scratch sealing surface and cause internal leakage.

5. آلية التجاوز اليدوي

The valve body is equipped with detenting manual pushbutton:

Press and rotate to lock, mechanically actuate pilot spool. Manual shifting available without power or coil energization, used for commissioning, air test and maintenance.

6. Concise Principle Comparison Table