How does the STOP STP-B brass pneumatic shut-off valve with GW behave when the pilot air signal is lost?

The STOP STP-B brass pneumatic shut-off valve with GW is a pneumatically controlled valve that only allows airflow while a pilot (control) air signal is present. If the pilot air signal is lost, the valve closes in both flow directions, cutting off supply to the actuator. When installed in the actuator supply line, loss of pressure at the control (pilot) port immediately stops actuator movement. Operating limits: 0.5â10 bar, temperature â10 Â°C to +60 Â°C; body: nickel-plated brass; seals: NBR. Use as a safety device should follow a proper pneumatic/system risk analysis.

Can the STOP STP-B brass pneumatic shut-off valve with GW be used as a safety device without performing a pneumatic system risk analysis?

No. The STOP STP-B brass pneumatic shut-off valve with GW should not be used as a safety device without first performing an appropriate pneumatic system or whole-machine risk analysis. Although the valve closes on loss of pilot pressure and stops actuator movement (0.5â10 bar, -10Â°C to +60Â°C, nickel-plated brass, NBR sealing), its suitability for safety functions depends on system design, failure modes, required safety integrity, and applicable standards - which must be verified by risk assessment.

Can the STOP STP-B brass pneumatic shut-off valve with GW operate safely at temperatures below -10Â°C?

The STOP STP-B brass pneumatic shut-off valve with GW is specified to operate at temperatures from -10Â°C to +60Â°C. Therefore, operation below -10Â°C is outside the declared operating temperature range and cannot be guaranteed by the manufacturer. Below -10Â°C the following risks may occur: NBR seals hardening or losing elasticity, increased leakage, slower or blocked valve response, possible material brittleness or altered clearances affecting function. If you must use the STOP STP-B brass pneumatic shut-off valve with GW below -10Â°C, perform a thorough risk analysis of the pneumatic system and device, validate performance in the intended low-temperature conditions (including seal behavior and pilot reliability), or consider alternatives with low-temperature-rated seals (e.g. FKM, EPDM, PTFE) and components specified for the expected minimum temperature.

STOP STP-B brass pneumatic shut-off valve with GW

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Additional information

Material	B – brass (bronze)

STOP valve series STP-B with internal thread is a pneumatically controlled valve. It allows air flow through the valve upon simultaneous application of a pneumatic control signal (pilot). In the event of a loss of the control signal, the valve is closed in both flow directions. The STP-B valve installed in the actuator supply connection causes, in the absence of pressure at the control connection (pilot), the stopping of the actuator movement. The use of STP-B valves as safety valves should be preceded by an appropriate risk analysis of the pneumatic system or the entire device. Operating pressure: 0.5 to 10 bar. Operating temperature: from -10°C to +60°C. Body material: nickel-plated brass. Sealing: NBR.

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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STOP valve series STP-B with internal thread is a pneumatically controlled valve. It allows air flow through the valve upon simultaneous application of a pneumatic control signal (pilot). In the event of a loss of the control signal, the valve is closed in both flow directions. The STP-B valve installed in the actuator supply connection causes, in the absence of pressure at the control connection (pilot), the stopping of the actuator movement. The use of STP-B valves as safety valves should be preceded by an appropriate risk analysis of the pneumatic system or the entire device. Operating pressure: 0.5 to 10 bar. Operating temperature: from -10°C to +60°C. Body material: nickel-plated brass. Sealing: NBR.