Ball valve autocad blocks

Actuation Actuation. Instrumentation Instrumentation. Strainers Strainers. Filters Filters. Pumps Pumps. Accessories Accessories. Cart is empty. Just unscrew the two assembly nuts and lift the valve out of the line for service. Reversible seats need only be removed, turned over and reinstalled to put a valve back on line. Double o-ring stem seals, easily actuated and many available options make these valves the right choice. Request Information.

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Sliding Drawing elements Entertainment Music instruments Exterior Street furniture Foliage, trees, plants Furnishing Furniture Seating Industrial Food, drinks Kitchen equipment Kitchen sink Kitchenware Medical care Projects Fire protection Shop, service Sport field The stem transmits motion from the handle or controlling device to the disc.

The stem typically passes through the bonnet when present. In some cases, the stem and the disc can be combined in one piece, or the stem and the handle are combined in one piece. The motion transmitted by the stem may be a linear force , a rotational torque , or some combination of these Angle valve using torque reactor pin and Hub Assembly. The valve and stem can be threaded such that the stem can be screwed into or out of the valve by turning it in one direction or the other, thus moving the disc back or forth inside the body.

Some valves have no external control and do not need a stem as in most check valves. Valves whose disc is between the seat and the stem and where the stem moves in a direction into the valve to shut it are normally-seated or front seated. Valves whose seat is between the disc and the stem and where the stem moves in a direction out of the valve to shut it are reverse-seated or back seated. These terms don't apply to valves with no stem or valves using rotors. Gaskets are the mechanical seals, or packings, used to prevent the leakage of a gas or fluids from valves.

A valve ball is also used for severe duty, high-pressure, high-tolerance applications. They are typically made of stainless steel , titanium , Stellite , Hastelloy , brass , or nickel. Many valves have a spring for spring-loading, to normally shift the disc into some position by default but allow control to reposition the disc. Relief valves commonly use a spring to keep the valve shut, but allow excessive pressure to force the valve open against the spring-loading.

Coil springs are normally used. Typical spring materials include zinc plated steel , stainless steel , and for high temperature applications Inconel X The internal elements of a valve are collectively referred to as a valve's trim. According to API Standards , "Steel Gate Valve-Flanged and Butt-welding Ends, Bolted Bonnets", the trim consists of stem, seating surface in the body, gate seating surface, bushing or a deposited weld for the backseat and stem hole guide, and small internal parts that normally contact the service fluid, excluding the pin that is used to make a stem-to-gate connection this pin shall be made of an austenitic stainless steel material.

Valve positions are operating conditions determined by the position of the disc or rotor in the valve. Some valves are made to be operated in a gradual change between two or more positions. Return valves and non-return valves allow fluid to move in 2 or 1 directions respectively. Operating positions for 2-port valves can be either shut closed so that no flow at all goes through, fully open for maximum flow, or sometimes partially open to any degree in between.

Many valves are not designed to precisely control intermediate degree of flow; such valves are considered to be either open or shut. Some valves are specially designed to regulate varying amounts of flow. Such valves have been called by various names such as regulating , throttling , metering , or needle valves. For example, needle valves have elongated conically-tapered discs and matching seats for fine flow control. For some valves, there may be a mechanism to indicate by how much the valve is open, but in many cases other indications of flow rate are used, such as separate flow meters.

In plants with remote-controlled process operation, such as oil refineries and petrochemical plants, some 2-way valves can be designated as normally closed NC or normally open NO during regular operation. Examples of normally-closed valves are sampling valves , which are only opened while a sample is taken. Other examples of normally-closed valves are emergency shut-down valves , which are kept open when the system is in operation and will automatically shut by taking away the power supply.

This happens when there is a problem with a unit or a section of a fluid system such as a leak in order to isolate the problem from the rest of the system. Examples of normally-open valves are purge-gas supply valves or emergency-relief valves. When there is a problem these valves open by switching them 'off' causing the unit to be flushed and emptied.

Although many 2-way valves are made in which the flow can go in either direction between the two ports, when a valve is placed into a certain application, flow is often expected to go from one certain port on the upstream side of the valve, to the other port on the downstream side.

Pressure regulators are variations of valves in which flow is controlled to produce a certain downstream pressure , if possible. They are often used to control flow of gas from a gas cylinder. A back-pressure regulator is a variation of a valve in which flow is controlled to maintain a certain upstream pressure, if possible.

Valves with three ports serve many different functions. A few of the possibilities are listed here. Three-way ball valves come with a T- or L- shaped fluid passageways inside the rotor. The T valve might be used to permit connection of one inlet to either or both outlets or connection of the two outlets.

The L valve could be used to permit disconnection of both or connection of either but not both of two inlets to one outlet. Shuttle valves automatically connect the higher pressure inlet to the outlet while in some configurations preventing flow from one inlet to the other.

Single handle mixer valves produce a variable mixture of hot and cold water at a variable flow rate under control of a single handle. Thermostatic mixing valves mix hot and cold water to produce a constant temperature in the presence of variable pressures and temperatures on the two input ports. A 4-port valve is a valve whose body has four ports equally spaced round the body and the disc has two passages to connect adjacent ports.

It is operated with two positions. It can be used to isolate and to simultaneously bypass a sampling cylinder installed on a pressurized water line.

It is useful to take a fluid sample without affecting the pressure of a hydraulic system and to avoid degassing no leak, no gas loss or air entry, no external contamination Many valves are controlled manually with a handle attached to the stem. If the handle is turned ninety degrees between operating positions, the valve is called a quarter-turn valve.

Butterfly, ball valves, and plug valves are often quarter-turn valves. If the handle is circular with the stem as the axis of rotation in the center of the circle, then the handle is called a handwheel. Valves can also be controlled by actuators attached to the stem.

They can be electromechanical actuators such as an electric motor or solenoid , pneumatic actuators which are controlled by air pressure , or hydraulic actuators which are controlled by the pressure of a liquid such as oil or water. Actuators can be used for the purposes of automatic control such as in washing machine cycles, remote control such as the use of a centralised control room , or because manual control is too difficult such as when the valve is very large.

Pneumatic actuators and hydraulic actuators need pressurised air or liquid lines to supply the actuator: an inlet line and an outlet line.