Knife Gate Valve Vs Gate Valve

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.

Knife gate valve vs gate valve.

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 vs. The plug of the plug valve may be cylindrical or conical shape. Compared with the ordinary gate valve the structure of the knife.

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. Glands cannot be of screwed or union types and are always bolted. Utilizing a sharp beveled edge a knife gate was ideally designed to cut through the stringy pulp encountered in the pulp and paper industries. 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. Since gate valves can either be in the fully open or fully closed state the resistance of the fluid flow when the valve is fully opened is smaller. The packing seals the gate itself against the body. The packing box is not circular but rectangular.

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. Knife gate valves were designed with a sharp edge to cut through the pulp and seal. Knife gate valves perform exactly as the name implies. Knife gate valves utilise a blade with a sharp or bevelled edge.

Knife gate valves were originally designed for use in the pulp and paper industry. 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. Another significant difference between an ansi gate valve and a knife gate valve is in the packing gland area.

Gate valves use a movable door or gate to open and close the valve. This gate is lowered or raised using a mechanically assisted operator which is normally a threaded screw. The gate lifts out of the body as the valve opens. While a knife gate valve performs exactly as the name implies.

The gate valve is only available with metal seats. In addition the knife gate valves are designed to slowly open and close to safeguard against the impacts of water hammer. The benefits of knife gates also include that they are easy to actuate and cheap to produce. Stringy pulp would impinge between the wedge and seat of a normal gate valve and prevent flow shut off.