Taiwan SHAKO PU520-02-S 5/2-Way Solenoid Valve

Not SMC, it is a 5/2-way électrovanne manufactured by Taiwan SHAKO. Often mislabeled as SMC in the market.

PU520-02-S Technical Specifications

Type de vanne: 5/2-chemin, solénoïde unique, retour à ressort

Actionnement: Internal pilot operated

Ports: P/A/B ports G1/4 (02), R/S exhaust ports G1/8

Effective cross-sectional area: 18 mm²

Pression de service: 0.15-0.8 MPa (1.5-8 kgf/cm²)

Pression d'épreuve: 0.99 MPa

Médias: Air comprimé, filtration accuracy 40 μm, oil-free lubrication acceptable

Température ambiante: -10~+50℃

Classe de protection: IP65; Insulation class F

Cycle de service: 100% fonctionnement continu

Corps de vanne: Anodized aluminum alloy; Weight approx. 270 g

Commande manuelle: Lockable manual button

Standard coil voltages: DC24V, AC110V, AC220V; other voltages optional

Décodage du modèle

Sélection alternative

1. SMC equivalent reference: SY5120-02 (G1/4, 5/2-way single solenoid, internal pilot)
2. Alternative nationale: 4V310-08 (G1/4, comparable flow capacity)

Notes d'application

1. Minimum supply pressure for internal pilot version is 0.15 MPa. It will fail to shift below this pressure. For low-pressure conditions use external-pilot type PU520A-02-S.
2. Coil uses DIN socket. Provide waterproof protection for outdoor installation.
3. Commande manuelle: Press to lock, rotate to release, used for cylinder commissioning without power supply.

Operating Principle of SHAKO PU520-02-S (Internal Pilot 5/2-Way Single Solenoid Valve)

Assembly consists of two parts: Upper pilot assembly (bobine + small pilot spool) + Main spool assembly (main spool + ressort de retour).

The coil only drives a small pilot valve. The main spool is not driven directly by electromagnetic force; it is actuated by air pressure differential. Internal-pilot design requires supply pressure ≥0.15 MPa for proper shifting.

Définition du port

P.: Air supply inlet (G1/4)

UN, B: Connect to two chambers of double-acting cylinder

R., S: Ports d'échappement, normally fitted with silencers

1. Bobine hors tension (État normal, retour à ressort)

Return spring pushes main spool to home position.

Air circuit path:

P → B supply air; A → R exhaust

Compressed air outputs from port B to one side of cylinder; air from opposite cylinder chamber exhausts through port A to atmosphere. Cylinder stays retracted / home position.

2. Bobine alimentée (Shift action)
3. Bobine alimentée, electromagnetic force pulls pilot armature, opens small internal pilot passage.
4. Supply air from port P flows through internal passages to control end of main spool.
5. Air pressure overcomes return spring force and shifts main spool assembly.
6. Main air circuit switches: P → A supply air; B → S exhaust.

Port A outputs compressed air to extend cylinder; exhaust air from cylinder opposite side discharges via port B through S port.

3. Bobine hors tension, réinitialisation automatique

Electromagnetic force disappears, pilot spool resets and cuts pilot air supply.

Main spool returns to original position under return spring force. Air circuit reverts to de-energized state, cylinder automatically returns to home position.

⚠️ Key Points

1. Internal pilot relies on supply air pressure. No valve shifting below 0.15 MPa. For low-pressure scenarios select PU520A-02-S (external-pilot version with separate control air supply).
2. -S single solenoid: spring return on power loss. -D double solenoid: no return spring; maintains position upon power loss, requires opposite coil energization for reversal.
3. Commande manuelle: press and lock for forced shifting; rotate to release. Used for cylinder test without power.

Difference from Direct-Acting Solenoid Valves

Direct-acting: Coil pushes main spool mechanically. Higher power consumption, lower flow rate, works at zero pressure.

PU520 internal pilot: Low coil power, prend en charge 100% service continu, capacité de débit élevée, minimum operating air pressure required.

Application Scenarios of SHAKO PU520-02-S

Core characteristics: Internal-pilot 5/2-way single solenoid valve, Port G1/4, drives double-acting cylinder, spring return when coil de-energized; minimum supply pressure ≥0.15 MPa.

Typical functions: Cylinder extend-retract reciprocation; pneumatic gripper opening/closing, stopper, levage, pushing, clamping actions.

Machinery Industry Applications

1. Machines d'emballage

Verticale / machines d'emballage horizontales, soudeuses de caisses, heat-sealing machines, bagging machines

Actions: Pushing material, material stopping, bag clamping, cutter cylinder, lifting stations

Caractéristiques: Medium flow capacity, continuous energization, PLC-controlled cylinder reciprocation, widely used in packaging equipment.

2. Automation Conveyors & Assembly Equipment

Assembly jigs, machines de transfert, sorting stations, conveyor stoppers

Actions: Stopper cylinders, lifting cylinders, push cylinders, simple fixtures

-S single-solenoid advantage: Automatic reset when signal drops; cylinder returns to safe position during fault conditions; saves PLC output points.

3. Rubber-Plastic & Injection Molding Auxiliary Equipment

Injection machine peripherals: grippers, door actuation, ejector mechanisms; extruder cutting units

Rubber machinery, compression molding pneumatic clamping, hopper gate actuation

4. Machines à bois

CNC routers, edge banding machines: workpiece clamping, poussée de matériau, arrêt, positioning cylinders.

5. Impression & Machines textiles

Printing press paper hold-down; textile machine pneumatic clamping, swing link reciprocating mechanisms.

6. Machines alimentaires

Simple filling equipment, material sorting, pneumatic baffles.

Note: Standard anodized aluminum body, not for direct contact with food media; only controls clean compressed air.

General Tooling & Special-Purpose Machines

1. Pneumatic fixture jigs: Welding fixtures, test jigs; workpiece clamping, auto-release upon power failure.
2. Machine-tool pneumatic systems: Pneumatic chucks, safety doors, protective gate cylinders.
3. Manutention des matériaux: Hopper dampers, flip gates, discharge mechanisms.

Conditions de travail inappropriées (Pièges de sélection)

1. Supply pressure persistently below 0.15 MPa: Internal-pilot cannot shift. Use PU520A-02-S external-pilot variant.
2. Position retention required after power loss: Do not use -S single solenoid; select -D double-solenoid with latching spool.
3. Zero-pressure start, vacuum circuits: Sans objet.
4. Heavy-corrosion, exposed outdoor environments: Add coil protective cover; bare installation not recommended.
5. Explosive-hazard areas: Order E1 explosion-proof coil version.

Compatible Actuators & Accessoires

Suitable cylinder bore: Φ32-Φ80 double-acting cylinders (Port G1/4, 18 mm² flow area for medium-size cylinders).

Accessoires: Silencers, flow control throttles, manifold bases for multi-valve centralized mounting.

Référence de sélection rapide

Core Advantages of SHAKO PU520-02-S Solenoid Valve

Positionnement: Taiwan-made internal-pilot 5/2-way solenoid valve. Benchmarked against SMC SY5120 and Airtac 4V310. Rapport qualité-prix élevé, capacité de débit élevée, robust for industrial conditions. Widely deployed in packaging, conveyors and special-purpose automation machines.

1. Excellent Flow Performance

Effective sectional area 18 mm², Port G1/4. Delivers high flow within compact footprint. Drives Φ32-Φ80 double-acting cylinders with fast response, avoids sluggish cylinder movement or insufficient thrust.

Body width only 26 mm, space-saving inside cabinets. Supports multi-valve stacking on MF520 manifold bases.

2. Robust Mechanical Construction

Anodized aluminum alloy valve body, abrasion and corrosion resistant. NBR spool seals resist oil contamination in factory compressed-air systems, long service life for continuous cyclic operation.

Coil rated for 100% service continu (ED100%), withstands permanent energization without burnout. Insulation class F, Protection IP65, good tolerance to workshop dust and humidity.

Options de tension: DC24V, AC220V, AC110V. Optional LED indicator lamps, E1 explosion-proof coils for hazardous-area applications.

3. Convenient Commissioning & Entretien

Lockable manual override button: Press to force spool shift; rotate to release. Permits cylinder testing without electrical power, great for on-site commissioning and troubleshooting.

Standard DIN socket connection. Coil can be replaced individually without removing entire valve body; reduces spare-part costs.

Two pilot configurations available: standard internal-pilot PU520-02-S; low-pressure PU520A-02-S external-pilot variant, same valve housing for flexible specification change.

4. Comprehensive Product Portfolio

Full series covers 5/2-way single / double solenoid, plus 5/3-way valves (center exhaust / center pressure / center closed). G / RC / NPT thread options for domestic and export equipment.

-S spring-return improves safety by returning actuators to safe state on power loss; -D latching double-solenoid for gate mechanisms requiring position retention.

5. Cost-Effective Supply

Performance comparable to SMC SY5120 series at lower price point; higher reliability than low-end generic domestic valves, suitable for mass machine OEM.

Ample stock availability across domestic distributors; easy procurement and field replacement, widely adopted for custom automation machinery.

6. Limites & Notes de sélection
7. Internal-pilot model requires minimum supply pressure ≥0.15 MPa. Use PU520A-02-S external-pilot for low-pressure air supply.
8. Not designed for ultra-high-frequency cycling (tens of cycles per second). Optimized for typical machine cycle rates.
9. Standard version not suitable for direct outdoor or heavy-corrosion exposure; add protective measures.

Résumé de la sélection

✅ Prefer PU520-02-S: Machines d'emballage, lignes de convoyeurs, fixture jigs, general-purpose automation, stable air supply, seeking balance of performance and cost.

✅ Supply pressure below 0.15 MPa: Specify PU520A-02-S external pilot.

✅ Cylinder position must hold after power cut: Select PU520-02-D double solenoid.

SHAKO Main Solenoid Valve Models

SHAKO solenoid families: PU series (classic high-flow), BM series (new compact series), PU322 / BM320 (3/2-chemin). 5-port valves for double-acting cylinders; 3-port valves for single-acting cylinders / ventouses sous vide.

PU Series (Classic Line, PU520-02-S belongs to this family)

Body width 26 mm, haut débit, compatible with MF520 manifolds. Suffix-A = external pilot for low-pressure operation.

5/2-Électrovannes de voie

5/3-Électrovannes de voie (Double bobine, cylinder intermediate stop)

PU530-02-D-X: Center exhaust, A/B ports vented, cylinder free-floating

PU530-02-D-Y: Center pressure, A/B ports pressurized

PU530-02-D-Z: Center closed, A/B ports sealed for cylinder position lock

Port options 02(G1/4), 03(G3/8), 04(G1/2).

3/2-Way PU322 Series (Suction cups, vérins simple effet)

PU322-02-S: G1/4, solénoïde unique, normalement fermé

PU322-02-N-S: Normalement ouvert, air passes when coil de-energized

BM Series (New compact replacement for PU series)

Identical functional performance, interchangeable mounting dimensions, MF520 manifold compatible.

5/2-Way

BM520-02-S: G1/4 single solenoid spring return (direct equivalent to PU520-02-S)

BM520-02-D: G1/4 double solenoid

BM520A-02-S/D: External-pilot variants

BM520-03-S/D, BM520-04-S/D: Larger port sizes

5/3-Way

BM530-02-D-X (center exhaust), BM530-02-D-Y (center pressure), BM530-02-D-Z (center closed)

3/2-Way BM320 Series

BM320-01-S (G1/8), BM320-02-S (G1/4), for suction cups and single-acting cylinders.

Complete Suffix Definition (Order Reference)

Order example: PU520-02-S-9-L：PU520, Port G1/4, solénoïde unique, DC24V, with LED indicator.

Matching Manifold Bases

MF520-02-02: PU/BM520 manifold base, G1/4, 2-station; 03=3-station. Multi-station configurations available for centralized air supply and exhaust.

Guide de sélection rapide

1. Standard automation, cylinder auto-retract on power loss: PU520-02-S / BM520-02-S
2. Cylinder position retention required after power-off: Select -D double solenoid
3. Supply pressure below 0.15 MPa: Order external-pilot variant PU520A-02-S
4. Cylinder intermediate stop function: PU530 / BM530 5/3-way (choose center-exhaust / center-pressure / center-closed)
5. Suction cup or spring-return single-acting cylinder: PU322 / BM320 3/2-way

PU vs BM Series Comparison