Slide Gate Valve Vs Knife Gate Valve

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.

Slide gate valve vs knife gate valve.

These types of valve were originally designed for the pulp and paper industry. Stringy pulp would impinge between the wedge and seat of a normal gate valve and prevent flow shut off. While a knife gate valve performs exactly as the name implies. In terms of advantages disadvantages knife gate valves are generally limited to ansi class 150.

Knife gate valves perform exactly as the name implies. Knife gates are to cut through thick liquids and gases. Our staff has many years of combined experience in building knife gate valves in particular. Knife gate valves were designed with a sharp edge to cut through the pulp and seal.

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. 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. Bi directional valves may be tested in one or both directions. Stringy pulp would impinge between the wedge and seat of a normal gate valve and prevent flow shut off.

A knife gate valve is a component that utilizes a blade to cut through clogging of heavy liquids. We handle every facet of the fabrication process from engineering to. The fundamental difference is the quantum series orifice slide gate is designed specifically to handle dry material like powders pellets and granules. We specialize in custom knife gate valves from 2 to 96 and above utilizing carbon steel to stainless steels and other weldable alloys.

Certified tests are available upon request at time of order. Refer to standard shut off chart below notes 1. This type valve is being used more often now for high temperature steam systems as thermal binding is not a problem. These types of valve were originally designed for the pulp and paper industry.

Pratt knife gate and slide gate valves have been produced since 1995. With slide gates only one of the two seats are actually sealed. 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.