Comparison of 4 Leading Dual Safety Valves for Stamping Presses

Choosing a dual safety valve (clutch valve) is one of the most critical technical decisions, directly impacting operator safety and the lifespan of the stamping press. The four leading brands today – Ross (USA), Azbil (Japan), Toyooki (Japan), and Top Air (Taiwan) – each have distinct design philosophies and advantages. This article provides a detailed analysis to help you make the optimal choice.

Comparison of 4 dual safety valves Ross J3573, Azbil MVS-3500Y, Toyooki AD-SL231, and Top Air DVX

The four most common dual safety valve series for industrial presses

Overview Comparison Table

Feature	Ross J3573 Series (USA)	Azbil MVS-3500Y (Japan)	Toyooki AD-SL231 (Japan)	Top Air DVX Series (Taiwan)
Valve Structure	Poppet	Poppet	Poppet	Piston Seat (Similar to Poppet)
Monitoring Method	Internal E-P Dynamic Monitoring (Safest)	Option: Proximity Sensor (YCK) or Limit Switch (YCL)	Built-in Limit Switch	Break contact switch (Limit Switch)
Key Advantages	Extremely durable (dirt tolerant), high flow (Cv), dynamic self-monitoring.	Flexible (multiple monitoring options), modern (proximity sensor available).	Energy saving (>30%), IP67, fast response, competitive price.	Very competitive price, dirt tolerant structure, easy replacement.
Disadvantages	Highest cost, large size.	YCL type (limit switch) can experience mechanical wear.	Monitoring via mechanical switch (requires maintenance).	Requires maintenance for mechanical switch. Less established brand history.

Detailed Analysis of Each Valve Series

1. Ross J3573 (The Gold Standard for Durability)

Ross is an American giant, and the J3573 series is considered the industry standard. Its most valuable feature is the internal E-P dynamic monitoring system, which continuously checks the synchronicity of the two valve bodies, automatically locking out if any discrepancy is detected. The poppet structure makes the valve extremely durable even with less-than-ideal compressed air quality.

Ross J3573 dual safety valve for presses

The Ross J3573 valve is renowned for its durability and dynamic monitoring mechanism.

Monitoring: Internal E-P (Electro-Pneumatic) dynamic monitoring.
Structure: Poppet, superior resistance to dirt and wear.
Suitable for: Applications requiring absolute durability, harsh compressed air environments, and where budget is not the primary concern.

2. Azbil MVS-3500Y (Flexibility and Modernity)

Azbil (from Japan) offers high flexibility by allowing a choice between two monitoring technologies. The YCK type uses a proximity sensor (non-contact) for virtually indefinite mechanical durability, while the traditional YCL type uses a limit switch. This is a modern, balanced choice.

Azbil MVS-3500Y dual safety valve with sensor

The Azbil MVS-3500Y offers an optional proximity sensor monitoring.

Monitoring: Optional Proximity Sensor (YCK) or Limit Switch (YCL).
Structure: Typically spool type, requires clean compressed air.
Suitable for: Modern press systems, applications requiring non-contact monitoring (YCK) for extended lifespan.

3. Toyooki AD-SL231 (Efficiency and Savings)

Toyooki (Japan) focuses on operational efficiency. The AD-SL231 series stands out for its energy-saving capabilities (over 30%) and IP67 water/dust resistance rating. The valve uses a durable poppet structure and monitors via a limit switch, offering an excellent balance between cost, performance, and long-term operating expenses.

Energy-saving Toyooki AD-SL231 dual safety valve

The Toyooki AD-SL231 valve is optimized for saving operational energy costs.

Monitoring: Integrated Limit Switch.
Structure: Poppet.
Suitable for: Factories looking to balance initial investment with long-term operational savings (electricity) and having a good periodic maintenance plan.

4. Top Air DVX Series (Economical Choice)

Top Air (Taiwan) offers a cost-effective solution, very popular on common press lines. The DVX series uses a "Piston Seat" structure (similar to poppet), thus also having good dirt tolerance. The valve uses limit switch monitoring similar to Toyooki, ensuring basic safety at the lowest investment cost.

Cost-effective Top Air DVX dual safety valve

The Top Air DVX valve is an economical solution for many types of presses.

Monitoring: Break contact switch (Limit Switch).
Structure: Piston Seat (Similar to Poppet).
Suitable for: Applications prioritizing initial investment cost, replacement for common presses, requiring periodic maintenance.

Recommendation: Which One to Choose?

The choice of a dual safety valve directly depends on 3 factors: safety priority level, factory compressed air quality, and budget.

When to choose Ross J3573?

Priority on absolute durability: Choose Ross J3573 when your number one priority is robustness, the compressed air environment is not ideal, and budget is not a major issue.

When to choose Azbil MVS-3500Y (YCK Type)?

Priority on modern monitoring technology: Choose Azbil YCK if you want non-contact monitoring technology to eliminate the risk of mechanical switch wear, suitable for high-end presses.

When to choose Toyooki AD-SL231?

Balancing cost and energy saving: Choose Toyooki AD-SL231 when you need a high-quality Japanese product, want to save on long-term operating costs (electricity), and have a good periodic maintenance plan.

When to choose Top Air DVX?

Priority on investment cost: Choose Top Air DVX when it's a cost-effective replacement solution, particularly suitable for common press lines, and you accept the need for regular monitoring switch maintenance.

Still undecided? Each press system has unique requirements. Let our engineers advise you on the optimal safety solution for your factory.