Does the STOP STP-U brass pneumatic shut-off valve with GW check valve require a specific orientation for correct operation and sealing?

The STOP STP-U brass pneumatic shut-off valve with GW check valve does require correct orientation for proper operation and sealing. As a safety shut-off installed on an actuatorâs supply port, it must be fitted so that the check valve and internal flow path align with the intended direction of the control signal: supply air must enter the valveâs designated inlet and exit toward the actuator. Incorrect orientation (reverse installation) can prevent the valve from allowing airflow when the pneumatic control signal is present, compromise the check-valve function, and may lead to leakage or failure to stop the actuator when control pressure drops. Additionally, ensure thread sealing and torque are correct for the NBR seals and nickel-plated brass body to achieve reliable sealing within the stated operating pressure (0.5â10 bar) and temperature range (â10 Â°C to +60 Â°C).

Can the STOP STP-U brass pneumatic shut-off valve with GW check valve handle media other than compressed air without performance loss?

STOP STP-U brass pneumatic shut-off valve with GW check valve is designed and specified for pneumatic service (compressed air) with NBR seals, operating 0.5â10 bar and â10Â°C to +60Â°C. Using media other than compressed air (e.g. gases with oils, aggressive gases, vacuum, or liquids) can degrade NBR sealing, corrode or swell components, change leakage and response, and impair the GW check valve function. Nickelâplated brass resists many but not all fluids; compatibility must be checked per specific media, pressure and temperature. Conclusion: it is intended for compressed air-using other media risks performance loss unless manufacturer confirms compatibility for the exact fluid and conditions.

Is the STOP STP-U brass pneumatic shut-off valve with GW check valve suitable for vacuum service?

No. the STOP STP-U brass pneumatic shut-off valve with GW check valve is not suitable for vacuum service. It is designed and specified for pneumatic (positive) pressure operation in the range 0.5 Ã· 10 bar and operates by allowing airflow only when a control pressure is present; it stops the actuator after a drop in control pressure. Its specifications (minimum operating pressure 0.5 bar), sealing (NBR), and internal design for check-valve function do not guarantee reliable sealing or controlled flow under vacuum or negative pressure conditions. Using it in vacuum service risks leakage, improper operation, and possible damage; select a valve explicitly rated for vacuum if vacuum operation is required.

STOP STP-U brass pneumatic shut-off valve with GW check valve

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Additional information

Material	B – brass (bronze)

STOP shut-off valve series STP-U with a check valve and internal thread, primarily used as a safety valve. When installed on the actuator’s supply connections, it allows airflow only in the presence of a pneumatic control signal. The actuator is stopped after a drop in control pressure. Operating pressure: 0.5 ÷ 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-W6001001001	STOP valve with STP-U check valve, G 1/8" / GZ 1/8", pilot G M5	-	10	In stock	Enquiry
MW-W6001011011	STOP valve with STP-U check valve, G 1/4" / GZ 1/4", pilot G 1/8"	-	10	In stock	Enquiry
MW-W6001021021	STOP valve with STP-U check valve, G 3/8" / GZ 3/8", pilot G 1/8"	-	10	In stock	Enquiry

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STOP shut-off valve series STP-U with a check valve and internal thread, primarily used as a safety valve. When installed on the actuator’s supply connections, it allows airflow only in the presence of a pneumatic control signal. The actuator is stopped after a drop in control pressure. Operating pressure: 0.5 ÷ 10 bar. Operating temperature: from -10°C to +60°C. Body material: nickel-plated brass. Sealing: NBR.