How does the STOP STP-B Brass Pneumatic Shut-Off Valve with Female Thread behave if pilot pressure is suddenly lost during actuator operation?

When the STOP STP-B Brass Pneumatic Shut-Off Valve with Female Thread pilot pressure is suddenly lost during actuator operation, the valve immediately closes in both flow directions, cutting off air supply to the actuator and stopping movement. Installed in the actuator supply line, it guarantees immediate cessation of motion in the absence of pilot pressure, preventing unintended actuator activity. The valve is designed for reliable fail-safe behavior within 0.5–10 bar and −10°C to +60°C operating limits; constructed of nickel-plated brass with NBR seals for durable performance. Prior to using as a safety device, perform a full pneumatic system risk analysis to ensure compliance with applicable safety standards.

Can the STOP STP-B Brass Pneumatic Shut-Off Valve with Female Thread be used as a certified safety device in redundant pneumatic systems, and what verification is required?

Yes — the STOP STP-B Brass Pneumatic Shut-Off Valve with Female Thread can be used as part of a redundant pneumatic safety solution, but it is not a standalone certified safety device. It is a normally-closed, pilot-operated shut-off that fails safe (closes both directions) on loss of pilot signal, making it suitable for stopping actuator motion when installed in the actuator supply line. Required verification and actions: - Perform a documented risk assessment of the complete pneumatic system or machine to define safety functions, performance levels (PL or SIL where applicable), required reliability, and fault tolerances. - Validate that the valve’s characteristics (fail-safe behavior, operating pressure 0.5–10 bar, temperature range −10°C to +60°C, materials and seals) meet the system safety requirements. - Demonstrate redundancy and architecture: include redundant valves/controls or architectures that meet the target safety integrity (e.g., dual-channel with cross-monitoring) if a certified safety level is required. - Conduct functional testing (including proof tests, leakage, cycling and failure-mode tests) and include results in the safety dossier. - Verify compatibility with other components (piloting source, filters, fittings) and environmental conditions. - Include maintenance, diagnostics, and periodic inspection procedures in the safety documentation. - If certification to a specific standard is required (e.g., EN ISO 13849, IEC 61508/IEC 62061), perform the necessary system-level validation and, if needed, obtain third-party assessment or certification of the complete safety function (component-level certification of the valve alone is not sufficient). In summary: STOP STP-B can be used within a certified redundant safety system after system-level risk assessment, architectural design for required safety integrity, and verification/testing documented to the applicable safety standards.

Valve shut-off pneumatic brass alloy STP-B with female thread

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Additional information

Material	B – brass (bronze)

Valve alloy series STP-B with thread internal is valve controlled pneumatic. allows on Flow rate air through valve po simultaneous applying pneumatic signal control (the pilot). W case loss signal control valve is closed in both directions flow. valve STP-B mounted in the connection supply actuator causes, at the absence pressure on the connection control (the pilot), stopping movement actuator. use valves STP-B as valves safety should be preceded appropriate analysis risk the system pneumatic or the entire devices. Working pressure: 0.5÷10 bar. Operating temperature: od -10°C up to +60°C. Body material: brass nickel-plated. sealing: NBR.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
MW-W6001101001	Valve STOP STP-B, 1/8" female / 1/8" male, pilot 1/8" female	-	10	In stock	Enquiry
MW-W6001111011	Valve STOP STP-B, 1/4" female / 1/4" male, pilot 1/8" female	-	10	In stock	Enquiry
MW-W6001121021	Valve STOP STP-B, 3/8" female / 3/8" male, pilot 1/8" female	-	10	In stock	Enquiry

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Valve alloy series STP-B with thread internal is valve controlled pneumatic. allows on Flow rate air through valve po simultaneous applying pneumatic signal control (the pilot). W case loss signal control valve is closed in both directions flow. valve STP-B mounted in the connection supply actuator causes, at the absence pressure on the connection control (the pilot), stopping movement actuator. use valves STP-B as valves safety should be preceded appropriate analysis risk the system pneumatic or the entire devices. Working pressure: 0.5÷10 bar. Operating temperature: od -10°C up to +60°C. Body material: brass nickel-plated. sealing: NBR.