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Metal Seated?

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Help with Gas Valves specifications:

Media
           
   Your choices are...         
   Gasoline / Diesel Fuel       Gasoline / diesel fuel is a mixture of flammable liquid hydrocarbons derived chiefly from crude petroleum and used as a fuel for internal-combustion engines. 
   High Purity Gas       High purity gas is designated by manufacturer as being applicable and built for high purity applications - includes nitrogen, argon, oxygen, hydrogen, and H.P. mixtures. 
   LP - Gas       Liquefied petroleum is a gas containing specific hydrocarbons that are gaseous under normal atmospheric conditions, but can be liquefied under moderate pressure and temperatures. Propane and butane are examples. 
   Natural Gas       Natural gases are liquid hydrocarbon mixtures that are gaseous at reservoir temperatures and pressures, but are recoverable by condensation or absorption. 
   Sour Gas       Sour gas is hydrogen sulfide (H2S) laden gas. 
   Specialty / Corrosive Gases       Specialty corrosive gases. 
   Other       Other unlisted, specialized, or proprietary media. 
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Specifications
   Valve Size       Valve size is the designated size of the valve by manufacturer.  This typically represents the size of the passage opening. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
   Pressure Rating       Maximum safe pressure value for which the valve is rated. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
   Metal Seated       Valves with metal seats are designed for severe applications such as high pressure and or temperature. Seats can be made of various materials such as carbon and stainless steel to withstand  the demanding applications. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
   Connection       
   Your choices are...         
   Threaded       The valve has internal or external threads for inlet or outlet connection(s). 
   Compression Fitting       A sealed pipe connection without soldering or threading. As the nut on one fitting is tightened, it compresses a washer around the second pipe, forming a watertight closure. 
   Bolt Flange       The valve has a bolt flange(s) for inlet or outlet connection. 
   Clamp Flange       The valve has a clamp flange(s) for inlet or outlet connection. 
   Union       The valve has a union connection for inlet or outlet connection(s). 
   Tube Fitting       The valve has a connection for directly joining tubing at the inlet and/or outlet connections. 
   Butt Weld       The valve has a butt weld sized connection for inlet or outlet connection. 
   Socket Weld / Solder       The valve has a socket weld connection for inlet or outlet connection. 
   Metal Face Seal       The valve has a metal gasket sandwiched between two fitting parts. The gasket forms a face seal on each side of the fitting. 
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Material of Construction
           
   Your choices are...         
   Acetal       Acetal polymers are semi-crystalline. They offer excellent inherent lubricity, fatigue resistance, and chemical resistance. Acetal suffers from outgassing problems at elevated temperatures, and is brittle at low temperatures. Glass filled, and added lubrication grades are available, flame-retardant grades are not. Brand names include Celcon® (Hoechst Celanese), Delrin® (DuPont), Thermocomp® (LNP), Ultraform® (BASF), and Acetron® (DSM). 
   Aluminum       Aluminum is a bluish silver-white malleable ductile light trivalent metallic element that has good electrical and thermal conductivity, high reflectivity, and resistance to oxidation. 
   Brass / Bronze       Brass comes with good strength, excellent high temperature ductility and reasonable cold ductility, good conductivity, excellent corrosion resistance, good bearing properties and low magnetic permeability.  Sintered bronze is a porous material, which can be impregnated with oil, graphite or PTFE. Not suitable for heavily loaded applications but useful where lubrication is inconvenient. 
   Cast Iron       The term "cast iron" refers not to a single material, but to a family of materials whose major constituent is iron, with important trace amounts of carbon and silicon. Cast irons are natural composite materials whose properties are determined by their microstructures - the stable and metastable phases formed during solidification or subsequent heat treatment. The major microstructural constituents of cast irons are: the chemical and morphological forms taken by carbon, and the continuous metal matrix in which the carbon and/or carbide are dispersed. 
   Copper       A common reddish metallic element that is ductile and malleable and is one of the best conductors of heat and electricity. 
   CPVC       Chlorinated polyvinyl chloride (CPC) a higher type grade of plastic commonly used for hot / cold water distribution, sprinkler piping, and some chemicals. Suitable for high temperatures. 
   Ductile Iron       Ductile iron retains cast iron's machinability and corrosion-resistance, and provides additional strength, toughness, and ductility. Although it’s chemical properties are similar to those of cast iron, ductile iron incorporates significant casting refinements, additional metallurgical processes, and superior quality control. 
   Exotic Metal       Exotic metals and alloys have specialized properties. This category includes materials such as Hastelloy®, Monel®, beryllium copper, beryllium nickel, niobium, tantalum, titanium and zirconium. 
   Nylon - Polyamide       Thermoplastic resin used for mechanical parts.  Can be extracted, cast or injection molded.  The most common commercial grade is Nylon 6/6.  Can to glass filled to further enhance structural impact strength and rigidity. 
   PEEK       Polyetheretherketone or Polyketones. PEEK is a semi-crystalline thermoplastic with excellent mechanical properties. 
   Polyethylene (PE)       Commodity thermoplastic that is soft, flexible and tough - even at low temperatures - with outstanding electrical properties but poor temperature resistance. It also has very good chemical resistance but is prone to environmental stress cracking; it has poor UV resistance (unless modified) and poor barrier properties, except to water. 
   Polypropylene (PP)       Polypropylene is a thermoplastic material exhibiting excellent cold flow, bi-axial strength, and yield elongation properties. It is similar to PVC but can be used in exposed applications because of its resistance to UV, weathering, and ozone. 
   PTFE - Teflon®       Polytetrafluoroethylene (PTFE) is an insoluble compound that exhibits a high degree of chemical resistance and a low coefficient of friction. It is sometimes marketed in proprietary classes of materials such as Teflon®, a registered trademark of DuPont Dow Elastomers. 
   PVC       Polyvinyl Chloride (PVC) is a widely used material that has good flexibility, smooth surface, and nontoxic qualities. Some grades are used in food and chemical processes due to the inert nature of PVC. Brand names include: ACP® and Dural® (Alpha Gary), Geon® (Geon), Benvic® (Solvay), Flexalloy® (Teknor Apex). 
   PVDF       Polyvinylidene fluoride (PVDF) is a melt processable fluoropolymer. It is similar in properties to other fluoropolymer, but has better strength and lower creep than the other members of this family. PVDF has good wear resistance, and excellent chemical resistance. But does not perform well at elevated temperatures. Brand names include: Kynar® (Elf AtoChem). 
   Rubber       Any of several material compositions with properties similar to natural rubber. 
   Stainless Steel       Stainless steel is chemical and corrosion resistant and can have relatively high-pressure ratings. 
   Steel       Steel is a commercial iron that contains carbon in any amount up to about 1.7 percent as an essential alloying constituent. It is malleable when under suitable conditions, and is distinguished from cast iron by its malleability and lower carbon content. 
   Other       Other unlisted, specialized, or proprietary material. 
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Valve Type
           
   Your choices are...         
   Angle Valves       Angle valves have an inlet and outlet at 90 degrees, or a control mechanism that enters the valve body at an angle to conserve room and allow maximum flow. 
   Balancing Valves       Balancing valves are mixing valves that maintain a constant water temperature by balancing hot and cold supply lines. They are able to compensate for a pressure drop in either supply line and can maintain a consistent temperature. Balancing valves are sometimes referred to as pressure-balancing valves. 
   Ball Valves       Ball valves provide tight shut-off and characterizable control. They have high rangeability due to the design of the regulating element, without the complications of side loads typical of butterfly or globe valves. Advantages include ease of operation and high flow, high pressure, and high temperature capabilities. Disadvantages include low cleanliness and an inability to handle slurries. 
   Bellows Valves       Bellows valves have a bellows seal between the media and the valve's bonnet. Bellows valves provide a contaminant-free, positive shut-off for high purity gas / fluid systems. 
   Block and Bleed Valves       Block and bleed valves are configured so that flow through the valve is blocked at both the inlet and outlet, and a small port is provided to drain or depressurize the space between. This configuration is often required to isolate high-pressure sections of a system to facilitate safe maintenance or rapid depressurization.  These valves are also referred to as double block and bleed valves. 
   Blow Off Valves       Blow off valves (BOV) are used to blow pressure off the pipeline and in purging operations. Blow off valves are also used in the automotive industry to relieve pressure in the piping from the turbo to the inlet manifold when the throttle is backed off. When used in this way, they are referred to as compressor bypass valves. 
   Butterfly Valves       Butterfly valves control the flow of gas or liquid with a disk which turns on a diametrical axis inside a pipe, or by two semicircular plates hinged on a common spindle, permitting flow in only one direction. They are used as throttling valves to control flow. Butterfly valves offer a rotary stem movement of 90 degrees or less in a compact design. Unlike ball valves, butterfly valves do not have pockets in which fluids may become trapped when the valve is closed. Advantages include suitability for chemical services, small dimensions, and high coefficient of flow. Disadvantages include low cleanliness and the inability to handle slurries. 
   Cartridge / Manifold Valves       Cartridge valves are directional control valves that are inserted into manifolds to provide a cost-effective, compact system design. 
   Check Valves       Check valves are self-activating safety valves that prevent process flow from reversing. 
   Ball / Cone / Disk Check Valves       Ball and cone check valves use a free-floating or spring-loaded ball, cone, or disk resting in a seat ring as the closure element. Upon reverse flow, the ball is forced back into its seat preventing backflow. 
   Double Check Valves       Double check valves are assemblies that contain two distinct check valves. 
   Duckbill Valves       Duckbill valves are flow-sensitive, variable-area, check valves.  They get their name from their shape, which consists of two flaps shaped like a duck's bill. In zero flow conditions, the valve remains closed. As the flow increases, the pressure on the flaps increases and the valve opens. 
   Lift Check Valves       Lift check valves use a free-floating closure element, consisting of a piston or poppet and a seat ring.  The piston or poppet actuates either horizontal or vertical to the flow, depending on the valve construction. 
   Swing Check Valves       Swing check valves are designed with the closure element attached to the top of the cap. The closure element can be pushed aside by the flow, but swings back into the close position upon flow reversal. 
   Umbrella Check Valves       Umbrella check valves are elastomeric self activating devices.  These valves simply press into a hole and can be designed to function within a specified pressure range.  The name umbrella comes from the general shape of the device. 
   Wafer / Split Disc Check Valves       Wafer and split disc check valves have two half-circle disks hinged together. Upon positive flow, the disc come together and retracts to a full-circle to close against reverse flow. 
   Back Flow Preventer Assembly       Back flow preventers are assemblies of two check valves and two shut-off valves. They may also include test cocks for each chamber within the assembly. 
   Choke Valves       Choke valves are designed to control flow at a linear rate with respect to the actuator. They are often used within combustion engines and in the oil industry. 
   Clamshell / Bin Gate       Clamshell or bin gate valves are used to cutoff, restrict, or control the flow of solids with a disc or gate that swings across the flow path.  Some solids valves use inflatable sealing elements to reduce wear while maintaining a good seal. These valves are referred to by a number of names, including swing gate valves, rolling blade gate valves spherical disc valves, and double or single clamshell valves. 
   Compressor Valves       Compressor valves are used in reciprocating compressors, pumps and other devices to provide a hermetic seal for piston-driven gas compression. 
   Control Valves       Control valves or proportional valves are power-operated devices used to modify fluid flow or pressure rate in a process system. 
   Diaphragm Valves       Diaphragm valves are related to pinch valves, but use an elastomeric diaphragm instead of an elastomeric liner to separate the flow stream from the closure element. Instead of pinching the liner closed to provide shut-off, the diaphragm is pushed into contact with the bottom of the valve body.  Diaphragm valves are excellent for controlling the flow of fluids which contain suspended solids. They also offer the flexibility of installation in any position. Diaphragm valves are used widely in the pharmaceutical, food processing, and water treatment industries. Advantages include cleanliness and tight shut-off. Disadvantages include low pressure and temperature limits, and multi-turn operation. 
   Directional Valves       Directional valves direct or prevent flow through selected passages. 
   Diverter Valves       Diverter valves change the direction of the flow of a medium to two or more different directions. 
   Double Flap Airlock / Flap       Double flap airlocks, flap valves, louver-type dampers, two-way flap valves, double butterfly valves are used to shut-off the flow of bulk material.  The flaps can open sequentially to maintain the airlock between the hopper and conveyor or process unit. 
   Drain Valves       Drain valves allow the removal of surplus fluid from a system or container. 
   Excess Flow Valves (EFV)       Excess Flow Valves are application specific valves that are used to shut off flow in the event of an unusually high flow condition. 
   Foot Valves       Foot valves are a type of check valve with a built-in strainer. They are used at the point of liquid intake to retain liquid in the system. 
   Float Valves       Float valves automatically open or close as the level of a fluid changes. A float that rests on the top of the liquid operates these valves mechanically. 
   Gate / Knife Valves       Gate or knife valves are linear motion valves in which a flat closure element slides into the flow stream to provide shut-off. Gate valves are usually divided into two types: parallel and wedge-shaped. The parallel gate valve uses a flat disc gate between two parallel seats, upstream and downstream. Knife valves are of this type, but with a sharp edge on the bottom of the gate to shear entrained solids or separate slurries. Advantages include the ability to cut through slurries. Large sizes are commonly available. Disadvantages include pressure limitations, lack of cleanliness, and low shut-off. 
   Globe Valves       Globe valves are linear motion valves with rounded bodies, from which their name is derived.  They are used widely in industry to regulate fluid flow in both on/off and throttling service.  Advantages include precise throttling and control, as well as high-pressure limits. Disadvantages include low cleanliness and the inability to handle slurry. 
   Insertion and Tapping Valves       Insertion and tapping valves are valves used to connect to an operating pipe line without the need to empty the pipe. 
   Injection Valves       Injection valves are actuated valves that inject a controlled amount of fluid into a tank or process. 
   Iris Valves       Iris valves function like the iris mechanism in a camera. As the valve closes, the material is pushed out of the way.  On some iris valves, the mechanical components are enclosed in a flexible sleeve to protect against the ingress of particles. 
   Line Blinds       Line blind valves are used when assurance of no downstream leakage is required. A solid plate is placed in the flow path to prevent leakage. Any leakage that could occur will be outside of the flow path. 
   Metering Valves       Metering valves are capable of accurately controlling the flow of a fluid. 
   Mixing Valves       Mixing valves combine the flows of two or more inlets into a single outlet for applications such as temperature or concentration control. 
   Needle Valves       Needle valves have a slender, tapered point at the end of the valve stem that is lowered through the seat to restrict or block flow.  Fluid flowing through the valve turns 90 degrees and passes through an orifice that is the seat for a rod with a cone shaped tip. These small valves are widely used to accurately regulate the flow of liquids and gases at low flow rates. The fine threading of the stem and the large seat area allow for precise resistance to flow. Advantages: Precise control. Disadvantages: low-pressure limitations, no slurries. 
   Pilot Valves       Pilot valves are small valves that are used to operate larger valves. They generally require less applied power to turn the larger valve than if the larger valve was operated independently. Solenoid valves are often used as pilot valves. 
   Pinch Valves       Pinch valves include any valve with a flexible elastomer body that can be pinched closed, cutting off flow, using a mechanism or fluid pressure. Pinch valves are full bore, linear action valves so they can be used in both an off/on manner or in a variable position or throttling service. Some typical applications for pinch valves are medical, pharmaceutical, wastewater, slurries, pulp, powder and pellets. They can effectively control the flow of both abrasives and corrosives, as there is no contact between metal parts and the transport media. Advantages: Streamlined flow, high coefficient of flow. Disadvantages: limited materials, low shut-off capabilities, low pressure limits. 
   Piston Valves       Piston valves control fluid flow within a tube or pipe by motion of a piston moving in a linear path. 
   Plug Valves       Plug valves, also called cock or stop-cock valves, date back to ancient times, where they were developed for use in citywide Roman plumbing systems. Today, they remain one of the most widely used valves for both on/off and throttling services.  Their design is fairly simple; the body is comprised of three main parts: body, cover and plug.  The plug is a cylindrical, tapered, or generally cone-shaped device that can be raised or lowered within the seat to maintain, restrict or completely shut off flow.  The valve is opened by rotation with the plug itself being the only element that is capable of movement. Advantages: Easy operation, medium to high flow, good shut off. Disadvantages: Low cleanliness, inability to handle slurry. 
   Poppet Valves       Poppet valves open and close ports with a sealing device composed of a disk, cone, or sphere that is pressed against the seating surface using a spring. 
   Pressure Relief Valves       Pressure relief valves are self-actuated safety valves designed to relieve excess upstream pressure from the line. 
   Safety Valves       Safety valves contain a thermal sensing component that opens or closes in response to temperature changes or close a line and stop the flow of material when a pre-set condition occurs. 
   Sampling / Dispensing Valves       Sampling valves or dispensing valves are fitted to a reactor or pipeline to allow a small sample of a fluid to be withdrawn for testing or mixing. Some sampling valves ‘trap’ a small quantity of fluid in a chamber, and only this fluid is released when the valve is operated. 
   Sanitary / Hygienic Valves       Sanitary and hygienic valves are used in aseptic applications in the dairy, brewing, beverage, pharmaceutical and bio-chemical industries. 
   Servo Valves       Servo valves provide closed loop flow or pressure response to an electrical or electronic control signal. They are used in air, gas, and liquid applications. 
   Shut Off Valves       Shut off valves close a line to stop the flow of material when a pre-set condition occurs such as excess flow or a pressure pulse from a broken line or a temperature change from an idle burner. 
   Solenoid Valves       Solenoid valves are electro-mechanical devices that utilize a solenoid to control valve activation. 
   Spool Valves       Spool valves use a rotary or piston-like spool for actuation. The spool, or spools, rotate or slide back and forth to block and uncover ports in the housing. 
   Toggle Valves       Toggle valves are used for on-off control in moderate pressure and temperature applications. They feature a toggle mechanism for valve actuation. 
   Vacuum Relief / Anti-siphon Valves       Vacuum relief valves are automatic valves that open or close a vent to relieve a vacuum, depending on whether the vacuum is above or below a predetermined value. They are frequently used in hot water supply systems. An anti-siphon valve is a valve, usually plastic or brass, used to control the flow of water in one direction. It will prevent a backflow of water into the potable water supply. 
   Other       Other proprietary, specialized, or unlisted applications. 
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