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Types:

Port Size / OD:

Vacuum / Pressure Range:

Operating / Bake-out Temperature:

Port Flange / Fitting Type:

Port Flange (ISO Nominal Size):

Valve Seat Seal Type:

Actuator Shaft / Stem Bellows?

Valve Actuation:

Features:

Fail-Safe:

Help with Vacuum Valves specifications:

Types
   Types:       
   Your choices are...         
   Angle Valve       Angle valves have their inlet port positioned at a right angle to the outlet port. 
   Ball Valve       Ball valves are quarter-turn, straight through flow valves that have a round closure element with matching rounded seats that permit uniform sealing stress.  The type of seat can vary with the valve pressure rating and materials of construction.  Ball valves are not as widely applied in vacuum application compared to gate or other vacuum valves because gas can be trapped in the closure element. 
   Butterfly Valve       Butterfly valves are quick opening valves that consist of a metal circular disc or vane with its pivot axes at right angles to the direction of flow in the pipe, which when rotated on a shaft, seals against seats in the valve body. They are normally used as throttling valves to control gas flow. Butterfly valves control the flow of gas by means of a disk, which turns on a diametrical axis inside a pipe or by two semicircular plates hinged on a common spindle, which permits flow in only one direction.  These valves offer a rotary stem movement of 90 degrees or less, in a compact design.  Unlike ball valves, butterfly valves do not have any pockets in which gases may become trapped when the valve is closed.  
   Conductance Controller       Conductance controllers alter the conductance through the vacuum system by modifying the mean free path that the gas molecules must take.  Conductance is the gas flow per sec per unit of pressure differential.  Obstructions or restrictions interfere with molecular gas flow and reduce conductance.  Conductance controller may have a series of triangular vanes, baffles or a butterfly valve flapper that rotates open or close to obstruct the gas stream and maintain chamber pressure.  Conductance controllers are not true valves. 
   Diaphragm Valve       Diaphragm valves use a flexible diaphragm to separate the flow stream from the closure element.  The diaphragm is pushed, often by an actuating fluid, into contact with the bottom of the valve body to provide shut-off.  The diaphragm also maintains separation between the medium or gas delivered and the actuating fluid. 
   Gas Control / Leak Valve       Gas metering, throttling or leak valves control the flow of gas into chamber or process vessel. 
   Gate Valve       Gate valves (also known as knife valves or slide valves) are linear motion valves in which a flat closure element slides into the flow stream to provide shut-off. Gate valves and knife valves are designed to minimize pressure drop across the valve in the fully opened position, stop the flow of fluid completely and provide a leak tight closure.  Gate valves can provide high conductance or minimal pressure drop when opened fully. Gate valves are available with integral windows to allow viewing, spectroscopy or optical measurement of internal processes. 
   Inline Valve       Angle valves have their inlet port positioned at a parallel to the outlet port, but not necessarily axial with the inlet port. 
   Relief Valve       Vacuum or pressure relief valves protect chambers or components form excesses in vacuum or pressure that would otherwise deform or damage the component.  Some vacuum relief valves are designed to maintain as vacuum as close to the desired level as possible without causing overheating of the pump. Vacuum relief valve are typically set for less than maximum vacuum, which provide pump cooling by allowing the pump a degree of interior air circulation.  Adjusting spring tension on the valve typically controls the pressure or vacuum level. 
   Straight Through       Straight through valves have their inlet port positioned at a parallel to the outlet port as well as axial with the inlet port.  Straight through valves provide a line of sight opening from inlet port through to the outlet port. 
   Specialty / Other       Other unlisted, specialized, or proprietary valve type such as venting, bleeder, needle or bleed-off vacuum valves. 
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Specifications
   Port Size / OD:         
   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.
   Vacuum / Pressure Range:       
   Your choices are...         
   Rough / Low (< 760, > 1 torr)       Valves suitable for use under low vacuum (less than 760 torr and greater than 1 torr).  Low or rough vacuum valves are used on systems suitable for outgassing organic / biological samples, vacuum drying and certain welding and processing applications. 
   Medium (< 1, >10-3 torr)       Valves suitable for use under medium vacuum (less than 1 torr and greater than 10-3 torr).  The valves are used on medium vacuum chambers or systems, which are suitable for certain welding and processing applications. 
   High Vacuum (<10-3,>10-8 torr)       Valves suitable for use under high vacuum (less than 10-3 torr and greater than 10-8 torr).  High vacuum valves may require heating to bakeout surface contamination. 
   Ultra-high Vacuum (< 10-8 torr)       Valves suitable for use under ultra-high vacuum (less than 10-8 torr).  UHV valves often require heating to bakeout surface contamination. 
   Elevated Pressures (> 760 torr)       Valves suitable for processing or analysis with gases or internal atmospheres at positive pressures or above atmospheric pressure. 
   Other       Other vacuum or pressure range not specified. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Operating / Bake-out Temperature:       The maximum operating or bake-out temperature that the fitting, flange or vacuum component can be exposed to. 
   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.
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Flange & Seal Types
   Port Flange / Fitting Type:       
   Your choices are...         
   None       The valve does not have a port flange connection; rather the valve is directly connected to the line by welding, brazing, a threaded connection or other means. 
   Metal Seal (Wire / Copper Gasket)       A flange or fitting type using a metal seal such as a copper gasket.  Metal seals are suitable for extremely high vacuum levels since they do not contain volatile compounds. Examples of flanges or fittings using an all-metal seal are ISO-CF (copper ring seal), VSRTM (Swagelok fitting) or wire sealed flanges. 
   Elastomeric Seal / O-ring       A flange or fitting type using an elastomeric face seal such as an o-ring or gasket.  Elastomeric seals are not typically suitable for extremely high vacuum levels due to outgassing of volatile compounds from the seal.  O-ring seals can be useful where movement of the joint is required. Face seals typically incorporate o-rings that mate against the face of the opposite connector to form a seal.  Depending on the standard, the o-ring may be on the nose of the male threaded connector, or behind the male thread on the face of the backing nut. 
   ISO       ISO designates a flange connection with interface dimensions made to ISO (International Standards Organizations) specification such as ISO-BF, ISO-CF, ISO-KF, ISO-QF or ISO MF flange systems. 
   ANSI ASA       ANSI ASA is a bolted flange connection with interface dimensions made to ANSI (American National Standards Institute) specifications. The bolts in the flange pull the flanged ends together and forming a seal between the o-ring and flange faces.  ASA flanges are used in pairs with one smooth, flat faced flange and flange with a groove face for retaining the o-ring. 
   NPT Female       One or more female NPT thread ports. 
   NPT Male       One or more male NPT thread ports. 
   Conflat®       Conflat® connections are a proprietary bolted connection of Varian Associates.  The bolts in the flange pull the flanged ends together and forming a seal between the central metal or gasket and flange faces.  The metal gasket provides a seal suitable for high and ultrahigh vacuum applications.  Elastomeric gasket seals are suitable for leak checking and lower vacuum, unbaked applications. 
   Del-SealTM       Del-Seal connections are a proprietary bolted connection of MDC Vacuum Products Corporation.  The bolts in the flange pull the flanged ends together and forming a seal between the central metal gasket and flange faces.  Pyraflat flanges with copper gaskets can provide leak tightness to 10-13 torr at temperature up to 450°C.  Del-Seal flanges are compatible with Conflat® flanges. 
   PyraflatTM       PyraflatTM connections are a proprietary bolted connection of Thermionics Laboratory, Inc. PyraflatTM connections provide a ConflatTM-like seal in rectangular, triangular, trapezoidal or irregular shaped flanges.  The bolts in the flange pull the flanged ends together and forming a seal between the central copper or elastomeric gasket and the flange faces.  The o-ring is held in place by a central retainer or center ring. Pyraflat flanges with copper gaskets can provide leak tightness to 10-13 torr at temperature from -196°C to 500°C. 
   Tri-SealTM       Tri-SealTM connections are a proprietary bolted connection of A&N Corporation. Tri-SealTM connections have a unique flange system which functions like ISO-KF but accommodates metal gaskets for ultra-high vacuum applications.   The bolts in the flange pull the flanged ends together and forming a seal between the central copper or elastomeric gasket and the flange faces.  The o-ring is held in place by a central retainer or center ring. Tri-Seal flanges with copper gaskets can provide leak tightness down to 10-13 torr or up to 300 psi.  Tri-Seal flanges with elastomeric seals can provide leak tightness down to 10-9 std. cc/ sec or up to 300 psi. 
   VCRTM / VCOTM       VCO® and VCR® connections are proprietary threaded fittings of the Swagelok designed for vacuum applications.  VCO® fittings use an o-ring seal.  VCR® fittings use a metal or elastomeric gasket face seal. 
   Other       Other flange or fitting type not listed such as SwagelokTM
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Port Flange (ISO Nominal Size):      Nominal bore size.
   Your choices are...         
   NW 10       ISO or NW 10 defines a standardized flange geometry (12 mm face seat ID, 30 mm OD) for vacuum components so that elbows, tees, crosses and valves of a given size are compatible and can be interchanged in a system.  NW 10 is used in the smaller clamped flange components and some manufacturers will list their products as QF10, KF10 or ISO 10.  
   NW 16       ISO or NW 16 defines a standardized flange geometry (17 mm face seat ID, 30 mm OD) for vacuum components so that elbows, tees, crosses and valves of a given size are compatible and can be interchanged in a system.  NW 16 is used in the smaller clamped flange components and some manufacturers will list their products as QF16, KF16 or ISO 16. 
   NW 20       ISO or NW 20 defines a standardized flange geometry for vacuum components so that elbows, tees, crosses and valves of a given size are compatible and can be interchanged in a system.  NW 20 is used in the smaller clamped flange components and some manufacturers will list their products as QF20, KF20 or ISO 20.  
   NW 25       ISO or NW 25 defines a standardized flange geometry (26 mm face seat ID, 40 mm OD) for vacuum components so that elbows, tees, crosses and valves of a given size are compatible and can be interchanged in a system.  NW 25 is used in the smaller clamped flange components and some manufacturers will list their products as QF25, KF25 or ISO 25.  
   NW 32       ISO or NW 32 defines a standardized flange geometry for vacuum components so that elbows, tees, crosses and valves of a given size are compatible and can be interchanged in a system.  NW 32 is used in the smaller clamped flange components and some manufacturers will list their products as QF32, KF32 or ISO 32.  
   NW 40       ISO or NW 40 defines a standardized flange geometry (41 mm face seat ID, 55 mm OD) for vacuum components so that elbows, tees, crosses and valves of a given size are compatible and can be interchanged in a system.  NW 40 is used in the smaller clamped flange components and some manufacturers will list their products as QF40, KF40 or ISO 40.  
   NW 50       ISO or NW 50 defines a standardized flange geometry (41 mm face seat ID, 55 mm OD) for vacuum components so that elbows, tees, crosses and valves of a given size are compatible and can be interchanged in a system.  NW 50 is used in the smaller clamped flange components and some manufacturers will list their products as QF50, KF50 or ISO 50.  
   NW 63       Nominal flange bore size (or for tube ODs) of 63 mm or 2.5". 
   NW 80       Nominal flange bore size (or for tube ODs) of 80 mm or 3". 
   NW 100       Nominal flange bore size (or for tube ODs) of 100 mm or 4". 
   NW 120       Nominal flange bore size (or for tube ODs) of 120 mm or 4.75". 
   NW 160       Nominal flange bore size (or for tube ODs) of 160 mm or 6". 
   NW 200       Nominal flange bore size (or for tube ODs) of 200 mm or 8". 
   NW 250       Nominal flange bore size (or for tube ODs) of 250 mm or 10". 
   NW 320       Nominal flange bore size (or for tube ODs) of 320 mm or 14". 
   NW 400       Nominal flange bore size (or for tube ODs) of 400 mm or 16". 
   NW 500       Nominal flange bore size (or for tube ODs) of 500 mm or 20". 
   NW 630       Nominal flange bore size (or for tube ODs) of 630 mm or 24". 
   NW 800       Nominal flange bore size (or for tube ODs) of 800 mm or 32". 
   NW 1000       Nominal flange bore size (or for tube ODs) of 1000 mm or 40". 
   Other         
   Search Logic:      Products with the selected attribute will be returned as matches. Leaving or selecting "No Preference" will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Valve Seat Seal Type:       
   Your choices are...         
   None       The valve does not have a seal on the valve seat. 
   Metal Seal         
   Elastomeric Seal / O-ring         
   Other       Other valve seat seal type not listed 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Actuator Shaft / Stem Bellows?       The valve had an actuator shaft or stem bellows above the bonnet that contains or protect the valve stem or actuator preventing contamination. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
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Valve Actuation
           
   Your choices are...         
   None / Manual       Valve actuated by hand or by manually turning or moving a handle, lever or valve component. 
   Electric - Solenoid       Valve actuated by energizing a solenoid. 
   Electric - Piezoelectric Actuator       Valve actuated by energizing a piezoelectric device. These actuators are typically used for very precise gas metering, flow control or leak applications. 
   Electric - Motorized       Valve actuated by energizing a motor that turns or moves a handle, lever or valve component. 
   Pneumatic       Valve actuated by pneumatic or air pressure such as an air cylinder that turns or moves a handle, lever or valve component. 
   Electro-pneumatic       Valve actuated by an electropneumatic device. Electropneumatic actuation uses an air cylinder in combination with a solenoid controlled valve that controls the air flow into or out of the cylinder. 
   Other       Other unlisted, specialized, or proprietary actuation type. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Features
           
   Your choices are...         
   Heater Jacket       Integral or optional heater jacket to prevent condensation or provide bakeout capability. 
   High Conductance       Conductance is the gas flow per sec per unit of pressure differential.  Obstructions or restrictions interfere with molecular gas flow and reduce conductance.  Fully opening or high conductance valves are designed to have minimal obstructions or restrictions. 
   Integral Window       Gate valve or other vacuum valve with an integral window to allow viewing, spectroscopy or optical measurement of internal processes. 
   Multi-stage       Valve with multiple stages 
   Position Indicator       Visual, audible or electronic indicator showing if the valve is open, closed or the degree of closure. 
   Roughing Ports       A tee valve or a valve equipped with roughing ports to allow mechanical pump down before high vacuum conditions are reached. 
   Specialty / Other         
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Fail-Safe:       
   Your choices are...         
   Spring-to-Close / Normally Closed       Fail-safe mechanism using a spring to close the valve when a power failure occurs. 
   Spring-to-Open / Normally Open       Fail-safe mechanism using a spring to open the valve when a power failure occurs. 
   Other       Fail-safe mechanism using a specialty or proprietary technique to actuate the valve when a power failure occurs. 
   Search Logic:      Products with the selected attribute will be returned as matches. Leaving or selecting "No Preference" will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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