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- with double sided pipe connections
- with screw-in spigot
- standard with Viton-seal and one bar opening pressure
- other variations according to customer requirements
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WITT gas Non-return Valves protect equipment, pipelines and outlet points. Varying from 0.004 bar - 40 bar (0.06 - 580 psi) and flows between 0.010 m³/h - 3.000 m³/h (0.35 - 105925 SCFH) with any wanted connection. Nearly every application will find a solution when gas return has to be prevented.
Some non-return valves are flashback safe in accordance with EN 730 when natural gas and air are mixed, which can be mounted in nay position and do not require gravity.
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WITT safety devices are used to protect single cylinders, outlet points or pipelines against gas back feeding and flashback and meet various National and International Standards e.g. EN730. Appropriate checks are made by the certification authorities - BAM, TÜV and Underwriters Laboratories etc. Pressure control systems, points of use and complete energy supply systems (MECS) incorporate these devices.
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Pilot-operated check valves of the series CP allow free flow in one direction.
The counter-flow direction is blocked. By applying the pilot pressure, the poppet can be lifted from its seat against the pressure. Thus flow in the counter-direction is also possible. There are 1 and 2 stage poppets available with pilot ratios of 1 : 5 and 1 : 40, to suit different operating conditions.
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The check and pre-fill valves type F utilize a spring pre-loaded valve head.
The check valves type F enable free flow in one direction and block the flow in the opposite direction.
This valve is used as a high flow valve (check valve with hydraulic release) in top ram presses for quickly draining and replenishing press cylinders during opening and closing in rapid traverse mode. The smaller sizes may be equipped with a pre-reliefe device as an option to prevent pressure surges during decompression (high volume and high pressure surge).
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BUTTERFLY CHECK VALVE-COMBINED
1. FEATURES
This valve is operated by the actuator of cylinder,motor or etc for the
butterfly valve function.
If this valve is installed in front of pump,this valve can be used for
controling flux, however,at the time of emergency or electricity failure this
valve can be converted to check valve.
2. DESCRIPTION
-. SERVICE TEMP' : -20°C~+150°C
-. SERVICE CONDITION : SEA WATER , OIL , ETC
-. FLANGE RATING : ANSI , AWWA , DIN , JIS(KS) , ETC.
-. SIZE : 50A(2")~4000A(160")
-. FLANGE TYPE : FLANGE
-. ACTUATOR : CYLINDER , MOTOR , ETC.
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Description: This Ultra Miniature low cracking pressure check valve permits free flow in one direction and no (checked) flow in the opposite direction. This valve is specified in many applications because of its very low cracking pressure (typically less than 0.5 psig), its excellent repeatability, and leak-tight peration. Custom variations of barbed and threaded bodies are available. Contact the factory for details.
Material: Brass or 303 stainless steel.
Seals: Silicone. Optional materials: EPDM, Viton® and FFKM (Perfluoroelastomer)
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Global Manufacturer of Hydraulic Check, Relief, Flow Control and Directional Control Valves along with Quick Release Hose Couplings. Check Valve sizes to 2" and up to 6000 psi (414 bar)working pressure. Steel and Stainless Steel materials are standard with other materials available.
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Check valves for liquid flows or gas. Sealing through piston or elastomeric seals.
Pressure interval: 105 bar / 210 bar
Temperature interval: -20ºC / 200ºC
Connections: from 1/4" to 3"
Made in several alloys.
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Lift check valve
ND (nominal diameter): 15-300
other diameters or pressures under request
NP (nominal pressure): 10-420
Technology: Molded or Forged
Principle: Soupape
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Features:
The steel check valve features a simple, compact, low cost, low pressure drop design. This design also allows for flexibility in function. It can be scaled to any number of standard and non-standard sizes. All steel construction and Viton seals make it a durable and reliable performer while its easy to manufacture design makes it a cost-saver.
Specifications:
-1.5" size
-Scalable diameter
-Up to 250 psi
-All steel construction
-Yellow Zinc Plating
-Viton Seals
-Back flow hole, if needed
-Quantity Discounts
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Since 1900 when Atwood & Morrill Co., Inc. produced its first valve, it has innovated many advances in the valve industry. The company has developed an impressive range of high technology valves and gained a distinguished reputation for product integrity, performance and dependability.
The range includes:
Gate & Globe Valves
Atwood & Morrill - Parallel Slide Gate Valves
Atwood & Morrill - Three Way Globe Valves
Atwood & Morrill - Main Steam Isolation Valves
Atwood & Morrill - Wye Globe Valves
Non Return Valves
Atwood & Morrill - Feed Water Check Valve
Atwood & Morrill - Cold Heat Check Valve
Atwood & Morrill - Freeflow® Check Valve
Atwood & Morrill - Cold Heat Check Valve
Atwood & Morrill - Testable Check Valve
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Special design entailing practically no loss of head.
Body materials: Steel GE 280 or cast Iron GL 250 body, with or without coating.
Body coating: Ebonite, Butyl, Halar, Rilsan.
Hinge: Elastomer for all types of fluids.
Maximum operating temperature: 180°C.
Connection standards: Spacing NF.29 492, PN.10 - PN.16 and ASA 150
From DN.20 to DN.250
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Brass Midi Check Valves
Description:
Series 6 Brass Midi Check Valves are used in general industrial and plumbing applications. They feature a brass body with NPT female threaded end connections and positive back stop. Series 6 has a silent operation with low opening pressure and low pressure drop. It can be installed in a horizontal or vertical position. Maximum Pressure: 200psi (13.8 bar).
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Wafer type dual plate check valve
ND (nominal diameter): 50-1200
other diameters or pressures under request
NP (nominal pressure): 10-420
Technology: Molded
Principle: Double battant
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High Pressure. These valves are 316 S.S. ball type and soft seat (PTFE ring) in the 1/4 NPT, 1/2 NPT, 3/4 NPT, and 1 NPT sizes; Brass poppet on S.S. seat in the 2 NPT size. Control springs hold approximately 3 PSI. Optional higher pressure springs are available in the 2" NPT unit only.
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The check valves permit flow in one direction only; the operation of the valve is based on the movement of a small disc. The disc shifts within the housing as the pressure differential changes from forward to reverse. A flat surface on one side of the disc seals off flow, while the other side allows flow to pass.
The check valves offer low "cracking pressure" and a minimum differential forward flow, less than 0.005 PSI in the standard units.
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Cepex designs and manufactures an extensive family of check valves that can be used for a wide range of applications. These valves provide an exact and reliable control of fluids, and have been designed to offer maximum modularity and flexibility.
Spring check and ball versions are available in PVC-U and Corzan CPVC. As with other Cepex valve products, check valves are available in accordance with several dimensioning standards (Metric, BSP, ASTM, NPT, British Standard, JIS...).
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PKV-06 stainless steel pilot controlled non-return valve
Application
PKV-06 is used as a static load holder.
Specifications
The PKV-06 valve, made of stainless steel W.St.1.4301, allows unrestricted flow from V to C ports and blocks flows in the opposite direction until pressure is applied on the pilot port.
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Hinged and double hinge types, and counterweight.
Models with flanges or to mount between flanges according to type.
Valve and stopper in flake-graphite cast iron, in spheroid graphite cast iron, in bronze, in steel or in stainless steel, according to the type and class of pressure.
Face to face spacing meeting most national and international standards and notably: ISO, EN, NF, BS, DIN...
DN 40 / DN 400
Pressure classes: PN 10 - PN 16 - PN 25.
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Non-return valves and pilot operated non-return valves
Sandwich- and screw-in cartridge construction
Nominal sizes NG3-Mini, NG4-Mini, NG6 and NG10
Screw-in cartridges (only pilot operated non-return valves) in accordance with ISO 7789,
nominal sizes M18x1,5, M22x1,5 and M33x2
Maximum pressures up to 350 bar
Volume flows up to 100 l/min
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True Union Ball Check Valves
Y-Check Valves
Spring-Loaded Y-Check Valves
Swing Check Valves
Wafer Check Valves
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CHECK VALVES
ART. 001
The check valve has been one of the strong points of Ratti’s production. In fact, article 001 was the first product developed back in 1974.
This valve is filed from a full sturdy 316L bar of European certified make.
The valves have cylindrical gas female die connections, and the diameters available are as follows:1/4”, 3/8”,1/2”,3/4”, 1”, 1.1/4”, 1.1/2” and 2”.
Inside the valve his piston is supported on two points, in order to keep excellent alignment during any assembling position; these two supports are furnished with special millings to allow the passage of fluid with as least loading losses as possible, in comparison to the classic “drilled disc”.
The standard capacity of the valve is made in certified PTFE but it is also available in silicone, glass, copper or stainless steel upon request.
ART. 048
This valve was projected by Ratti to facilitate the dismantlement and cleaning process, in observation of pharmaceutical and bio-technologic plant regulations.
Innovation is the result of the use of an auto-aligning PTFE piston, and the conic support spring.
They are the only components present inside the valve.
The internal finishing is strictly lower than 0,4 Ra, the external part of the valve is polished and laser-marked indicating the direction of the assemblage, the dimension of the valve, the type of steel used, and the number of the tapping from the steelworks.
The semi-bodies are joined through a Tri-Clamp connection and they are filed from a sturdy 316L stainless steel full bar of European certified make.
The dimensions available are as follows: 1/2, 3/4”, 1”, 1.1/2”, 2” and 2.1/2”.
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VIC : IN LINE CHECK VALVE ( 3/8 , 3/4 , 1-1/4" SIZE)
VC4V : SUB-PLATE/THREADED/CARTRIDGE(3/8-1-1/2" SIZE)
VC5V : FLANGE TYPE ( 3/4, 1, 1-1/4, 1-1/2 & 2")
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Check Valve / Non-return Valves:
Non-return valves or check valves are made to precision of bubble free close. Heavy-duty corrosion resistance springs are used for longer life. End connection- 1/8" to 1" Male or Female threaded ends or double compression tube end.
Material of construction:
Brass, Stainless steel, Carbon steel, SS alloys and Aluminum. Pressure rating up to 6000 PSI.
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SERIES AP 64 SPRINGLESS ALL WELDED CHECK VALVE Defining the new standard of safety & ultraclean True Springless Design, free of springs or
poppets SS 316L VAR secondary remelt material 3,500 psig rated (241 bar)
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Swing Check Valves
Size range : DN6 - DN150 1/4" - 6"
Pressure rating : CL150, CL300, PN45, PN50
End connections : Screwed, Socket weld / butt weld, stubs
Configurations : Screwed, bolted bonnet
Materials : Bronze, gunmetal, austenitic stainless steel
Bestobell have a range of check valves available in either bronze or stainless steel, these are all fitted with a swing return allowing for use in any position. The PTFE seal incorporated into the valve disc ensures a drop tight shut off at ambient temperatures. Wide openings also allow high flow rates at low-pressure drops.
All materials used are selected for their suitability to function at cryogenic temperatures. All valves are cleaned and degreased for oxygen duty.
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Type:
Check valves (design according to BS1868, API 6D or ANSI B16.34)
Check valves for Navy application
Jacketed check valves
Cryogenic check valves
Pressure sealed cover check valves
Dual plate wafer check valves
Custom made check valves
Design: BS1868 - ANSI B16-34 – API 6D
Nominal size range: DN15 (1/2”) to DN500 (20”)
Pressure rating range: PN10/PN16 – Class 150 to Class 2500
End connections: flanges, socket welding, Hub ends,…
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