How do you lift a gate valve?

The best way to safely lift a gate valve is to use mechanical assistance, in the form of a backhoe, forklift or similar device to move the valve straight up or down into position.

How does a gate valve open and close?

Turning the handwheel rotates the stem, which moves the gate up or down via the threads. They require more than one 360° turn to fully open/close the valve. Lifting the gate from the path of the flow, the valve opens. Lowering the gate to its closed position seals the bore resulting in a full closure of the valve.

What does sluice valve do?

A large valve in which a rectangular or circular gate slides across the opening. It has been used in oil tankers to permit gravity flow from tank to tank, with the valve being operated from the weather deck.

How do you lift a butterfly valve?

The Procedure of Butterfly Valve Disassembly

1. Turn the disc (2) to closed position.
2. Remove the taper pins (6) in the disc (2).
3. Remove the packing gland (7).
4. Remove the stem (4) by pulling it out through the valve top plate.
5. Remove the disc (2) from the valve body (1) by pulling or rolling the disc out of the seat bore.

How does a gate valve work?

Gate valves work by inserting a rectangular gate or wedge into the path of a flowing fluid. They are operated by a threaded stem which connects the actuator (generally a hand wheel or motor) to the stem of the gate. When fully open, a gate valve has no obstruction in the flow path and so has a very low pressure drop.

Can gate valves be installed vertically?

Gate valves can be mounted in different orientations around the pipe line, but the preferred orientation is the stem placed vertical. It is not recommended to install upside down. The performance of a valve is dependent on proper mounting.

How do you open a gate valve?

The proper way to open a gate valve is to gently turn the handle counter-clockwise (to the left) without applying excessive force – do not ‘jerk’ the handle. A typical 1″ main control valve for a water line will take about six full turns to fully open. Stop turning as soon as there is any resistance.

Can butterfly valves be installed vertically?

API butterfly valves are bi-directional and may be installed with flow in either direction, vertically, or horizontally. If a choice of stem position exists, the valve should be installed with the stem in the horizontal position; this will minimize seat wear by distributing the stem and disc weight evenly.

Which way opens a gate valve?

Can a globe valve be installed vertically?

Globe valves must be installed and operated in the vertical position only. Manual globe valves must always be either fully open, or fully closed once installed and are not designed or intended for throttling applications.