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.

STOP STP-B Brass Pneumatic Shut-Off Valve with Female Thread

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Additional information

Material	B – brass (bronze)

The STP-B STOP valve with internal thread is a reliable, pneumatically controlled solution designed to ensure maximum safety and efficiency in pneumatic systems. Engineered to allow airflow only when a pneumatic control signal (pilot) is applied, it automatically closes in both directions if the signal is lost, effectively preventing unintended actuator movement. When installed in the actuator supply line, the valve guarantees immediate stopping of motion in the absence of pilot pressure, making it an ideal choice for applications requiring precise control and enhanced safety. Manufactured from durable nickel-plated brass and equipped with high-quality NBR seals, the STP-B valve offers long-lasting performance even under demanding conditions. With an operating pressure range of 0.5 to 10 bar and a temperature tolerance from -10°C to +60°C, it delivers dependable functionality across a wide spectrum of industrial environments. Before use as a safety component, a thorough risk analysis of the pneumatic system or complete device is recommended, ensuring compliance with safety standards while maximizing operational reliability.

List of product variants

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

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The STP-B STOP valve with internal thread is a reliable, pneumatically controlled solution designed to ensure maximum safety and efficiency in pneumatic systems. Engineered to allow airflow only when a pneumatic control signal (pilot) is applied, it automatically closes in both directions if the signal is lost, effectively preventing unintended actuator movement. When installed in the actuator supply line, the valve guarantees immediate stopping of motion in the absence of pilot pressure, making it an ideal choice for applications requiring precise control and enhanced safety. Manufactured from durable nickel-plated brass and equipped with high-quality NBR seals, the STP-B valve offers long-lasting performance even under demanding conditions. With an operating pressure range of 0.5 to 10 bar and a temperature tolerance from -10°C to +60°C, it delivers dependable functionality across a wide spectrum of industrial environments. Before use as a safety component, a thorough risk analysis of the pneumatic system or complete device is recommended, ensuring compliance with safety standards while maximizing operational reliability.