ZT-Cast iron knife gate valve 178 F304 gate/NBR seat

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The 178 series bidirectional knife gate valve is made of cast iron with NBR seat, non rising stem, lug type, PN10 flange connection. Several features available : non rising handwheel, quick lever, with limit switch.

In industry, valve leakages are a common occurrence, even in valves classified as bubble-tight. Rather than a strict zero leakage requirement, various tolerance levels exist for each type of valve. For example, steel gate valves have an acceptable liquid leakage rate of 10 cc/hr per inch of nominal pipe diameter, according to MSS SP-61. 

The impact of a leaking gate valve depends on the type of leakage, of which there are two. One is fugitive emissions, where the process fluid leaks into the atmosphere. While the other is when leakage remains within the piping system. Both types are safety concerns, but fugitive emissions have the added impact of environmental damage.

Check Valves – Bolted Bonnet

Size Range: 2″ to 36″
ASME Class: ASME Class 150 to 1500
Design Standard: API 594
Materials: WCB & LCC

DSI cast steel check valves yield minimal restriction to low-velocity environments and are ideal for preventing backflow in unidirectional flow applications in horizontal or upward (vertical) flow. The tilting disc design offers closing that reduces the possibility of slamming.

Tags: Valve