Plug Valves G4Z

DURCO G4 plug valves from FLOWSERVE offer tighter shutoff than other rotary design valves and emissions containment equal to or better than specially designed severe service valves. They are a best choice for difficult chemical applications and for isolation of pumps, tanks, reactors and other critical equipment.

Compared to our standard G4 plug valves, the plug valve series G4Z comes in fire sealed design. Flowserve has provided thousands of Durco HF Alkylation valves to refineries throughout the world. Phillips licensing listed and UOP process division approved! They are a best choice where drop-tight shutoff is an absolute requirement.

Fire sealed sleeveline valves incorporate special Grafoil packing rings at the stem and Grafoil gaskets at the top cap that reduce atmospheric leakage to a negligible amout should fire destroy the PTFE sleeve and diaphragm. A metal diaphragm keeps the Grafoil packing in place if the top seal is destroyed.


Plug Valve


Chainwheel, Electric Actuator, Pneumatic double-acting, Pneumatic single-acting, Lever, Topflange (ISO 5211), Gearbox with Handwheel


1/2", 3/4", 1", 1 1/2", 2", 3", 4", 6", 8", 10", 12", 14", 16", 18"

Flange connection

ANSI 300


ANSI B 16.10

Body material


Packing gland


Pressure range

Class 300




F/F, Flanges