Knife Gate Valve Vs Gate Valve

The plug valve is a closing or plunger shaped rotary valve that opens or closes by rotating the passage port on the valve plug 90 degrees or the same as the passage port on the valve body plug valve is difference from knife gate valve.

Knife gate valve vs gate valve.

Compared with the ordinary gate valve the structure of the knife. In addition the knife gate valves are designed to slowly open and close to safeguard against the impacts of water hammer. Stringy pulp would impinge between the wedge and seat of a normal gate valve and prevent flow shut off. There are many kinds of gate valves the knife gate valve is one of them also known as knife gate valve according to the structure type gate valve can be divided into plate gate valve and knife gate valve depending on the different connection mode the knife gate valve can be divided into flange type the lugs and the clip.

This gate is lowered or raised using a mechanically assisted operator which is normally a threaded screw. These types of valve were originally designed for the pulp and paper industry. Knife gate valves perform exactly as the name implies. Another significant difference between an ansi gate valve and a knife gate valve is in the packing gland area.

While a knife gate valve performs exactly as the name implies. The packing box is not circular but rectangular. The gate valve is only available with metal seats. These types of valve were originally designed for the pulp and paper industry.

The gate lifts out of the body as the valve opens. List of content for this article l plug valve application. Gate valves use a movable door or gate to open and close the valve. Knife gate valves utilise a blade with a sharp or bevelled edge.

Stringy pulp would impinge between the wedge and seat of a normal gate valve and prevent flow shut off. The plug of the plug valve may be cylindrical or conical shape. The knife gate valve is different from other gate valves in that the gate is not totally enclosed within the body see figure 3 8. The benefits of knife gates also include that they are easy to actuate and cheap to produce.

The purpose of a knife gate valve is to cut through solid or semi solid flows of heavy liquids utilising a blade unlike a slide gate valve which is a valve that uses a slide plate in order to control the flow of dry bulk material. Knife gate valves were originally designed for use in the pulp and paper industry. 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. The packing seals the gate itself against the body.

Both the wedge type gate valves and the knife gate valves are primarily designed for on off services where the valve is completely opened or completely closed. Knife gate valves vs. Glands cannot be of screwed or union types and are always bolted. Knife gate valves were designed with a sharp edge to cut through the pulp and seal.