CE Certification Manual Ammonia Globe Valve Supplier & Factory

Ammonia (NH₃) reacts aggressively with copper and copper-bearing alloys (such as brass, bronze, and gunmetal) in the presence of even trace moisture, forming complex cupric-ammonium compounds. This biochemical reaction induces rapid stress corrosion cracking (SCC) and metallurgical degradation, resulting in catastrophic shell or trim failure. Our ammonia globe valves are engineered with 100% copper-free metallurgy, using specialized low-temperature carbon steels, QT ductile iron, stainless steels, and PTFE.

Every shipment arrives with a complete EN 10204 Type 3.1 inspection certificate package. This includes raw material spectral chemical composition, mechanical tensile and Charpy V-notch impact test reports @ -46°C, hydrostatic shell pressure test logs (1.5x PN), pneumatic seat leakage test certificates (1.1x PN), CE PED Declaration of Conformity issued by a notified body, and detailed dimensional verification records.

Straight-through (in-line) globe valves are typically integrated into horizontal or vertical pipeline runs where standard flow direction is maintained, exhibiting a moderate pressure drop (higher Kv resistance). Angle globe valves change flow path by 90 degrees, offering a significantly lower pressure drop, reduced piping elbow requirements, and cleaner natural drainage, making them ideal for vessel liquid drop lines, pump suction connections, and condenser headers.

All Tianjin Top Valve ammonia globe valves feature a precision-machined upper backseat collar on the stainless steel stem that mates with an integral seat in the valve bonnet. When the handwheel is rotated to the fully open position, this metal-to-metal backseat provides a primary seal against system fluid pressure, isolating the packing gland box so technicians can safely inspect or replace compression rings without draining the entire system.

Yes. Due to the high structural integrity of normalized ductile iron and LCB cast steel bodies, along with PTFE/carbon-graphite seating, our ammonia valve series is compatible with propane (R290), propylene (R1270), and subcritical liquid CO₂ lines within design pressure limits (PN25 / PN40) and operating temperatures down to -50°C.