How does the Soft-Start Electric Valve for Compressed Air, APR, SYNTESI® Series prevent pressure surges during system start-up?

The Soft-Start Electric Valve for Compressed Air, APR, SYNTESI® Series prevents pressure surges during start-up by using a controlled, two-stage filling process. On receiving a control signal the shut-off valve opens while air first flows through a throttling valve, limiting flow so system pressure rises gradually to about 40–60% of supply pressure. Once that intermediate pressure is reached, the valve switches to full cross‑section flow, allowing normal operation. This staged opening avoids sudden inflows that create shock loads and mechanical stress on actuators and components. When the control signal is removed the valve closes and the system is safely vented. Designed for reliability, it operates at 3–10 bar, −10°C to +50°C, and delivers nominal flows from 1250 to 4800 l/min (at 6.3 bar, Δp = 1 bar), making it suitable for smooth start-ups and extended equipment life.

Can the Soft-Start Electric Valve for Compressed Air, APR, SYNTESI® Series be configured for different start-up pressures or flow rates to match specific pneumatic system requirements?

Yes. The Soft-Start Electric Valve for Compressed Air, APR, SYNTESI® Series can be configured to match different start-up pressures and flow requirements within its operating limits. It uses a two-stage operation: on activation the shut-off opens and air is throttled so system pressure rises gradually to approximately 40–60% of supply pressure, before switching to full flow through the entire cross-section. This staged behavior effectively provides a controlled, reduced initial flow and pressure ramp to limit shock loads. Configuration options to match system needs: - Selection of model size (SY1 or SY2) and appropriate BSP port size (1/8" to 1") to suit required flow capacity. - Choice of outlet tapping (BSP 1/8" on SY1 or BSP 1/4" on SY2) and plumbing layout to fine-tune flow paths. - Operating within supply pressure (3–10 bar) and temperature (-10°C to +50°C) ensures predictable 40–60% partial-fill behavior; nominal flow rates at 6.3 bar range from 1250 to 4800 l/min (Δp = 1 bar), so selecting the correct size provides different effective start-up flows. For precise matching of a specific start-up pressure or flow ramp outside general ranges, consult the manufacturer for detailed performance curves, possible internal throttling adjustments or customization options.

Soft-Start Electric Valve for Compressed Air, APR, SYNTESI® Series

Air preparation elements (FRL), All products/

Additional information

Maximum operating temperature [°C]	50
Minimum operating temperature [°C]	-10

The soft start valve ensures safe and controlled filling of pneumatic systems with compressed air by operating in two stages. When a control signal is applied, the shut-off valve opens and air flows gradually through the throttling valve, allowing the system to reach around 40–60% of the supply pressure before switching to full flow through the entire cross-section. This prevents sudden surges of air that could cause shock loads and mechanical stress on actuators and machine components. Once the control signal is removed, the valve closes and the system is safely vented. Designed for reliability and protection, the valve is available in sizes SY1 and SY2 with BSP connections from 1/8″ to 1″, and additional outlet connections of BSP 1/8″ (SY1) or BSP 1/4″ (SY2) located at both the front and rear. It operates within a supply pressure range of 3–10 bar and a temperature range of -10°C to +50°C, offering nominal flow rates from 1250 l/min up to 4800 l/min at 6.3 bar (Δp = 1 bar). This makes it an ideal solution for installations requiring smooth system start-up, enhanced equipment longevity, and dependable performance in demanding industrial environments.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
MW-5611A701	Electric soft start valve APR SY1 1/8 ELPN	-	-	In stock	Enquiry
MW-5612A702	Electric soft start valve APR SY1 1/4 ELPN	-	-	In stock	Enquiry
MW-5613A703	Electric soft start valve APR SY1 3/8 ELPN	-	-	In stock	Enquiry
MW-5623A703	Electric soft start valve APR SY2 3/8 ELPN	-	-	In stock	Enquiry
MW-5624A704	Electric soft start valve APR SY2 1/2 ELPN	-	-	In stock	Enquiry
MW-5625A705	Electric soft start valve APR SY2 3/4 ELPN	-	-	In stock	Enquiry
MW-5626A706	Electric soft start valve APR SY2 1 ELPN	-	-	In stock	Enquiry

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The soft start valve ensures safe and controlled filling of pneumatic systems with compressed air by operating in two stages. When a control signal is applied, the shut-off valve opens and air flows gradually through the throttling valve, allowing the system to reach around 40–60% of the supply pressure before switching to full flow through the entire cross-section. This prevents sudden surges of air that could cause shock loads and mechanical stress on actuators and machine components. Once the control signal is removed, the valve closes and the system is safely vented. Designed for reliability and protection, the valve is available in sizes SY1 and SY2 with BSP connections from 1/8″ to 1″, and additional outlet connections of BSP 1/8″ (SY1) or BSP 1/4″ (SY2) located at both the front and rear. It operates within a supply pressure range of 3–10 bar and a temperature range of -10°C to +50°C, offering nominal flow rates from 1250 l/min up to 4800 l/min at 6.3 bar (Δp = 1 bar). This makes it an ideal solution for installations requiring smooth system start-up, enhanced equipment longevity, and dependable performance in demanding industrial environments.