Use of Gate Valves in Marine & Mining Industry

Gate Valves are designed to serve as isolation valves. These valves help to control the flow of liquid through the pipes. To start or stop the water flow or any other kind of liquid, these valves are affixed to the pipelines.

Gate valves are primarily used for on/off applications. Gate valves are very common due to their simple design and ease of operation. The gate is raised by a threaded stem to allow fluid flow. Gate valves are not recommended for throttling, or restricting fluid flow by having the valve partially open.

Their Design:

Gate valves are very simple, and operate in either the fully open or fully closed position. By turning the handle on the top, the screw turns and moves the wedge up or down. The wedge is angled in such a way that if wear does occur, the wedge will still be guided into position. When a gate valve is fully open, there will be small pressure drop across the valve.

Contrarily, when the valve is fully closed, it is pressurized and very well sealed. With the appropriate pairing of a disc to seal the ring, no leakage occurs across the disc when the gate valve is closed. Gate valves open and close very slowly to prevent fluid hammers and consequent damage to the piping system.

Their Types:

Gate valves can be divided into two main types: Parallel and wedge-shaped. The parallel gate valves use a flat gate between two parallel seats, and a popular type is the knife gate valve designed with a sharp edge on the bottom of the gate. The wedge-shaped gate valves use two inclined seats and a slightly mismatched inclined gate.

Advantages

• Suitable for high temperature and high-pressure situations.
• Low pressure drops when fully open.
• Tight seal when fully closed.
• Relatively free of build-up.

• Low leakage, low maintenance, and Less noise level.
• ​​​​​​​Gate valves help to save energy and reduce total cost of ownership.

Disadvantages

• Slow response times requiring large actuator forces hence cannot be opened & closed quickly.
• ​​​​​​​Prone to vibration when the valve is partially open.
• Low pressure limitations.
• When subjected to erosion from the high velocity flow that occurs, gate when opened, eventually prevents tight shutoff. ​​​​​​​
  

Their Industrial Usage:

Gate valves can be used for a vast number of fluids. Gate valves are found in a variety of industries, such as underground water or sewage disposal applications. They are also commonly found in irrigation and distribution service lines. Gate valves are suited for high pressures and temperatures, and are also used for low-pressure steam, and non-corrosive gas or oil.

Marine Industry:

Each valve controls and regulates the flow of fluids through the pipes of almost every system aboard a ship. From hydraulic lifts to the drinking water, it’s clear that valves are a crucial part of any vessel.

When it comes to valves, it’s important that marine engineers know how they’re built, their function and how they should be maintained. The most commonly used valve aboard a shipping vessel is the gate valve. As the valve turns, a device raises or lowers to control the flow of liquid. In either design, gate valves work against the flow of water.

The gates will stop the flow of liquid, which can cause stress on the rest of the system. Closely monitored system can prevent any sort of problems from occurring. The main use of a gate valve is to allow the fluid to flow in both directions with ease. As well, due to its downside, the gate valve has to create a low-pressure system. Regular maintenance is a key. The gland packing which used to stop water leakage will need to be replaced at regular intervals. With simplicity and solid strength, the water valve is a trusted structure of Marine ships.

Mining Industry:

As industrial applications become increasingly more demanding, pressures on the design and gate valve suppliers have increased. They have to be suitable and adaptable to all types of external environments to operate reliably in the most demanding situations. The mill circuit presents a number of issues for valve selection. Large particle sizes, high percentages of solids and high specific gravity make valve selection critical to ensure the least possible downtime.

When considering introducing gate valves to the mill circuit it is important to be mindful of the shutdown procedure of the mill discharge pump and pipe work design. It is good design practice to mount the valves in a sloping pipe to avoid closing the valve against a settled bed of product, and also minimize time between shutdown and valve closure. Gate valve suppliers and manufacturers face an immense challenge while designing the valves. You will need a high performing gate valve that can provide outstanding isolation performance with  zero leakage shut-off, and no discharge to the environment during operation.

Why Us?

Valvulas Fevisa, a foremost valve manufacturers in Spain  produces extensive range with high grade of quality. Our complete valves solution includes BALL, GATE, GLOBE, CHECK, PLUG, BUTTERFLY, ESD, MOV Valves meets the necessities and guidelines. FEVISA brought within its expert ambit. We are centered around accomplising complete consumer loyalty of strong quality valves manufacturers.