Slide Gate Valve Vs Knife Gate Valve

Valves such as the butterfly valve and the bull nose knife gate are designed to be used in gas and liquid applications and suffer numerous problems when misused in a dry bulk handling application.

Slide gate valve vs knife gate valve.

Knife gate valves were designed with a sharp edge to cut through the pulp and seal. Stringy pulp would impinge between the wedge and seat of a normal gate valve and prevent flow shut off. Knife gates are to cut through thick liquids and gases. The fundamental difference is the quantum series orifice slide gate is designed specifically to handle dry material like powders pellets and granules.

Uni directional knife gate and slide gate valves have a seat on one side of the gate and the normal test is with pressure pushing the gate against the seat. In terms of advantages disadvantages knife gate valves are generally limited to ansi class 150. Knife gate valves were designed with a sharp edge to cut through the pulp and seal. Pratt knife gate and slide gate valves have been produced since 1995.

Stringy pulp would impinge between the wedge and seat of a normal gate valve and prevent flow shut off. Whereas a slide gate valve is a component utilizing a slide plate in order to better manipulate or control the flow of dry bulk material. A knife gate valve is a component that utilizes a blade to cut through clogging of heavy liquids. Certified tests are available upon request at time of order.

Our staff has many years of combined experience in building knife gate valves in particular. Knife gate valves perform exactly as the name implies. A gate valve will have a v ring packing set that seals the shaft attached to the gate while a knife gate valve has a packing gland that seals around the gate. Bi directional valves may be tested in one or both directions.

A knife gate has a very thin profile compared to its bulkier counterpart. This type valve is being used more often now for high temperature steam systems as thermal binding is not a problem. We specialize in custom knife gate valves from 2 to 96 and above utilizing carbon steel to stainless steels and other weldable alloys. These types of valve were originally designed for the pulp and paper industry.

While a knife gate valve performs exactly as the name implies. Refer to standard shut off chart below notes 1. With slide gates only one of the two seats are actually sealed.