OS&Y means “
outside stem and yoke
” or “outside screw and yoke”. OS&Y gate valves operate by opening and closing via a gate, which lowers into or rises out of the valve. Raising the gate allows water to flow through the valve while lowering the gate cuts off the water flowing through the valve.
What is a valve yoke?
A Yoke
connects the valve body or bonnet with the actuating mechanism
. The top of the Yoke holding a Yoke nut, stem nut, or Yoke bushing and the valve stem passes through it. A Yoke usually has openings to allow access to the stuffing box, actuator links, etc..
What is a characteristic of outside screw and yoke valves?
What is a characteristic of an outside screw and yoke OS&Y valve? An OS&Y Valve (outside screw & yoke)
functions by opening and closing via a gate, which lowers both in and out of the valve
. When the handle is turned clockwise the gate will close preventing any water from traveling through the valve.
How do I know if my OS&Y valve is open?
Outside Stem & Yoke (OS&Y) valve (also called an indicating gate valve)—Indicating type means that one can visually determine if the valve is open or closed. An OS&Y valve is
open when the threaded stem extends from the valve
. The valve is closed when the stem is not visible above the control wheel.
What is the yoke on a gate valve?
A Yoke
connects the valve body or bonnet with the actuating mechanism
. … One type of valve commonly used to control water flow to fire sprinkler systems is known as an OS&Y gate valve.
What is a post indicator valve used for?
Installed in the main water line serving a building, the Post Indicator Valve (PIV) is a valve
used to control the water supply to the fire sprinkler system
. Most commonly a raised post, the PIV is found in the yard near the building or mounted on the outside of the building.
What is the difference between Din and yoke?
First, what is the difference between them?
The yoke is a clamp-type mounting
, which is placed over the tank valve and then tightened into place. The DIN is a threaded valve, wherein you screw the regulator into the tank valve.
Which is better DIN or yoke?
A
DIN first stage is considerably less bulky than a yoke
and is overall more streamlined, with less risk of it snagging on anything. This is advantageous if you ever end up diving in any overhead environments such as wrecks, caverns or caves, which brings us nicely onto our next point…
What are the two types of valves in the heart?
tricuspid valve
: located between the right atrium and the right ventricle. pulmonary valve: located between the right ventricle and the pulmonary artery. mitral valve: located between the left atrium and the left ventricle. aortic valve: located between the left ventricle and the aorta.
What does it mean to back seating a valve?
A backseat is
a seating arrangement inside the bonnet
. It provides a seal between the stem and bonnet and prevents system pressure from building against the valve packing when the valve is fully open. Back seats are often applied in gate and globe valves (source: wermac.org).
How do you lubricate a post indicator valve?
Lubricate indicator post with
oil via screw post
at top of post. Opening or closing PIVs should take the same number of turns (±1⁄2). Ten inch valves will take ~ 31 to 34 turns.
What is zone control valve?
Zone Control Valve is
a system designed to separate the area in case of maintenance and to get the indication of fire zone
on a combination of Butterfly valve, Flow Switch, Pressure Gauge and Test & Drain Valves.
What’s the difference between a gate valve and a globe valve?
A gate valve can be used for starting and stopping flow but they cannot regulate the level of flow. … One of the big differences between a gate valve and a globe valve:
a gate valve can be installed in various directions while a globe valve only goes in one direction
.
What is the purpose of an outside stem and yoke valve?
The outside stem and yoke valve is the most common type of indicating valve. The valve
operates by raising and lowering a gate that cuts off the water flowing through the valve casing
.
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. If the valve has a rising stem its position can be seen just by looking at the position of the stem.
Is NRS gate valve?
What is the difference between NRS and OS&Y gate valves?
NRS means Non-Rising Stem
. OS&Y means Outside Stem and Yoke. In an NRS valve, the stem will turn to open and close the gate, but the stem does not move up or down as it turns.
