Knife Gate Valve Vs Gate Valve

Knife gate valves were originally designed for use in the pulp and paper industry.

Knife gate valve vs gate valve.

Knife gate valves were designed with a sharp edge to cut through the pulp and seal. This gate is lowered or raised using a mechanically assisted operator which is normally a threaded screw. Glands cannot be of screwed or union types and are always bolted. The packing box is not circular but rectangular.

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. 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. These types of valve were originally designed for the pulp and paper industry.

The plug of the plug valve may be cylindrical or conical shape. 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. While a knife gate valve performs exactly as the name implies. Gate valves use a movable door or gate to open and close the valve.

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 gate valve is only available with metal seats. Stringy pulp would impinge between the wedge and seat of a normal gate valve and prevent flow shut off. Knife gate valves were designed with a sharp edge to cut through the pulp and seal.

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. Knife gate valves vs. The benefits of knife gates also include that they are easy to actuate and cheap to produce. Another significant difference between an ansi gate valve and a knife gate valve is in the packing gland area.

Knife gate valves perform exactly as the name implies. These types of valve were originally designed for the pulp and paper industry. Compared with the ordinary gate valve the structure of the knife. List of content for this article l plug valve application.

In addition the knife gate valves are designed to slowly open and close to safeguard against the impacts of water hammer. 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. Utilizing a sharp beveled edge a knife gate was ideally designed to cut through the stringy pulp encountered in the pulp and paper industries. Knife gate valves utilise a blade with a sharp or bevelled edge.