ASVIN Automatic recirculation valve (ARC valve) is a kind of pump protection device. It automatic protects centrifugal pump when pump body occur cavitation damage or unstable (especially conveying hot water at low load operation medium). Once pump flow is lower than the preset flow, bypass can completely open to ensure the minimum required flow pump. Even running fully closed, namely running flow is zero, the minimum flow can also pass bypass for Automatic Recycle. Pressure reduced through the multistage bypass pressure reducing valve.

ASVIN Automatic recirculation valve has big bypass, and this valve is suitable for bypass with big flow, maximum pressure differential is 4MPa, specific choice is determined by factory.

According to the difference of inductive main flow, main valve disc check cone of automatic recirculation valve will automatically move to a certain position. At the same time the main valve disc drive bypass valve stem, transfer the movement of main valve disc to bypass, through control bypass valve disc position, change bypass throttling area, so as to control bypass flow. When main valve disc back into valve seat closed, all flow backflow through bypass. When mian valve disc to rise to top position, bypass is fully closed, all the flow of pump flow to process system. This valve set four functions in one body.

Flow perception: automatic recirculation valve main valve disc can automatically perceive main flow of process system, thereby according to the flow to determine position of main valve disc and bypass disc.

Recirculation control: automatic recirculation valve can inhale pump normal operation required minimum flow into storage device through bypass, so as to adjust pump H - Q characteristics, to realize recycling.

Bypass multistage pressure reducing: bypass control system can reduce the backflow medium from high-pressure pump outlet to appropriate backflow to low-pressure storage device with low noise small wear.

Check: automatic recirculation valve also has check valve effect, preventing the liquid backflow to pump body. Bypass non return function is standard.

Special bypass size can be customized. The max flow rate of bypass is subject to the max Kv value.

ASVIN range of Ball Valves are designed for use in hazardous and corrosive environment. All Ball Valves are preciously machined, designer durability and maximum efficiency to provide high quality and low cost.
Options: Full Bore - Three Piece - Turnunion

Features

• Manufacturing Standard BS 5351
• Testing Standard BS 5146
• Anti Blow Out stem
• One piece, 2 piece 3 piece and Full Bore, Reduced Bore
• End connection, screwed, socket weld, flanged and buttwelded extended pipes
• Valves with actuators can be supplied
• Valves 150 and above can be supplied with gear operation
• Valves can be supplied in Hastelloy "B" & "C" and Alloy Steel Material
• Valves with special seats are offered for high temp services and also for full vacuum, and glass filled PTFE Seats can be provided on request
• Valves can be offered with IBR Certificates
  Design Standards: BS-5351/API-6D
  Face To Face Dimension: ANSI B 16.10
  
  

Material of Construction

From bar stock in carbon steel or stainless steel (304, 316.304L, 316L, 321), Hastelloy B & C & Alloy 20.

Castings in carbon steel to ASTMA216GR.WCB.

Castings in stainless steel to ASTM A 351 GR. CF8/CF 8M/CF 8C/CF 3/CF 3M. Alloy20, Hastelloy B & C.

Castings in C.I. to I.S. 210 G.R.20.

Castings in Alloy Steel to ASTM A 217 C5, WC6, WC9, WC12.

Size Range

15mm to 600 mm

Pressure Rating

150/300/600/900/1500/2500 class.

Design

Fire safe design available.

Ends

Screwed to BSP/BSPT/NPT for sizes 15 mm to 50 mm flanged to ANSI.
DIN or BS standards for sizes 15 mm to 600 mm socket weld to ANSI B 16.11. for sizes 15 mm to 50 mm butt weld to ANSI B 16.25 for sizes 15 mm to 600 mm.

Accessories for Control Valves

Pneumatic

Styling, strength, compactness and simplicity of design have been combined to produce the best rotary actuator on the market today.

Bray pneumatic actuators are rack and pinion, opposed-piston actuators available in two versions: double acting and spring return.
They have a maximum pressure rating of 140 psi (10 Bar) and a temperature range of -13°F (-25°C) to -200°F (95°C). Offered for the first time to the industry are the unique actual are the unique actual piston guides and rings which have a very low coefficient of friction and absorb the side thrusts of the piston. Other features include internal porting which reduces the cost of easily damaged external tubing position indicator and travel stop adjustments.
Our patented spring return unit is designed with the housing length the same size as our double acting unit, and the spring cartridges are inherently safe.
The standard spring cartridge system is available for
40, 60, 80 and 100 psi services (3, 4, 5, 6 and 7 Bar).

Electric Actuators

Bray electric actuators are powered by a rugged high-torque, integral, single phase, reversible motor.
All models feature a disengage cable manual override. Included are two SPDT switches, shaft position indicator, motor overload protector and Available in NEMA 4 or NEMA 7 housings. Output torque from 275 to 48,000 Ib-ins.

Worm Gear

For manual override of pneumatic actuators. During pneumatic operation of the valve, the worm of the gear unit is disengaged. Should the valve require opening or closing in the event of power loss, manual rotation of the declutch lever will provide a camming action and engage th worm to the segmented worm the worm to the segmented worm gear.
Reverse rotation of the lever will allow for disengagement of the unit. Excellent for safe handling of spring return actuators. Available for 2” - 48” (50mm-1200mm) valves.

"ASIAN Excess Flow Check Valves" are safety mechanisms. They are to be installed in flow lines to and from pressure tanks, as near to the tank as possible. Their purpose is to shut off the flow of fluid from the tank in case of breakage or rupture of any flow line or fitting located on the outlet side of the valve.

Excess Flow Check Valves are normally open valves. They are to be positioned in the tank line or tank fitting so that high velocity of flow outward from the tank will force the valves to the closed position.
Each valve design is rated for one particular maximum rate of flow. It will allow the passage of any rate of flow less than, and up to and including, this maximum flow rate.
With an increase of velocity of flow, the valve will remain closed as long as this differential prevails.

It is evident that, if the valve is properly installed and the piping and fittings are properly sized for the installation, the valve automatically will close in case of breakage of the line or any fitting in the flow system on the side of the valve away from the tank unless the pressure in the tank is too low to maintain valve-closing velocity through the broken line.
When repairs to the system are made and pressure closed in, the slight seepage through the small orifice in the excess flow check valve head will, in time, allow pressures to equalize on both sides of the excess flow check valve and the excess flow check valve again will open to flow position and will be ready for further use.
Flow lines should be as short and as free from bends and other flow restrictions as possible. Lines and fittings should not be reduced to smaller size than the size of the line for which the valve is intended as indicated by the last size code letter in the valve number.

Check valves are fluid control devices that restrict the flow of media in a piping system to one direction. This broadly defined check valve function plays different roles in various industries.
Also known as non-return valves, one-way valves, or backflow preventers, check valves prevent flowing media from flowing back upstream.

Often called flapper style check valves, swing check valves are a more traditional variety.
The disc of a swing check valve is secured to the body of the valve by a trunnion and hinge arm, without the aid of a spring. Unlike a non-slam check valve, which opens and closes at rates comparable to the pressure of the fluid flow, a swing check valve opens and closes more suddenly, relying on the installation orientation, gravity, and reversing flow to close the valve.

Swing valves, because of their less controlled opening and closing mechanics, are used in less sensitive applications.
They are most commonly employed in large-scale pipeline applications, such as liquid, gas, and steam, generally only in horizontal configurations.
In particular, they’re often used in natural gas applications, as natural gas processing generally does not require as stringent pressure control as the oil and refining industry or in sewage and water treatment systems.

Both non-slam check valves and swing check valves are suitable for use in a wide range of applications.
Generally, though, non-slam check valves are ideal for vertical runs of piping, or complex applications that require constant and controllable pressure levels.
Alternatively, swing valves are often used in very large-volume applications, horizontal pipe runs, and those applications in which varying pressures and flow rates are not a concern. Due to the precise pressures required, non-slam check valves are commonly specified in various oil and gas, refining, and power industry processes.

Some styles of check valves are specifically designed to allow their disc, or flapper, to slam shut in certain conditions, such as the reversal of fluid flow.
This sudden shutting, or slamming, creates a wave of pressure in the liquid that reverberates throughout the system and, depending on the precise application, can ultimately lead to reduced process efficiency, valve damage, gasketed joint leaks and other issues.
This inevitable - but controllable - phenomenon is commonly referred to as water hammer.
Non-slam check valves are designed specifically for use in these situations.
As their name implies, these valves close without slamming, meaning no excess pressure spikes are created.
The disc of a non-slam check valve has an internal spring opposing the opening fluid flow pressure.
When the flow of a media is strong enough, the spring compresses and the valve opens; the disc is smoothly pushed back toward the seating surface in the valve by the spring as the flow decreases and stops, but before flow direction reverses

Conical Strainers strainer are temporary Strainers used mostly before startup of a Plant.
Use perforated wire - mesh or wedge wire to trap suspended solids from a process stream.
Conical strainers are usually installed horizontally in a piping system. Conical strainers are commonly used in pipelines to prevent damage of Gauges, pumps, control valves, Flow meters and other process equipment.
Fabricated Conical strainers from 2” to 24” (& larger sizes are available on request) designed in accordance with ASME Section VIII Div. 1.
Conical strainer available in CS, SS304, SS316, Duplex, Super Duplex.
Conical strainers are available in both Basket type and Cone Type Temporary Strainers.

Straight needle valves are manual valves intended for continuous throttling to achieve flow regulation.
Valves are fitted in circuits to allow the flow to be adjusted to suit variable operating conditions.
Straight needle valves are also used in instrument impulse lines to attenuate pressure pulsations to limit gauge reading fluctuations.
These “meter” valves are of a more robust construction. Some valves have accurate calibration, micrometre style scales, to permit repeatability.
Some needle valves are not recommended for isolation purposes, so product specifications must be checked carefully.
Like globe valves there is a preferred direction of flow: fluid enters the bottom of the seat, travels up the taper and exits from the top.
The stem of a needle valve is machined to an accurate taper and small valves can have a very sharp point on the end.
The seat, a much longer seat than in other valves, is machined to the same taper.

On opening, the valve creates a long narrow parallel flow passage.
As the stem is withdrawn the flow passage enlarges and reduces the flow losses.
Straight needle valves impose high losses in a circuit and have low C, values compared to other valve types. The nature of the flow passage excludes solids handling, and clean fluids are essential for acceptable component lives.

Needle value, optional with 30º poppet, V-notch, or rectangular slot.
The form of the throttle opening influences the fineness of the flow setting, which is dependent on the pressure and viscosity.
The needle is made of stainless steel and corresponds to a ring gap in the valve body.
The body can be steel or brass as well as for pipe line or for panel mounting.

Valve manifold finds its applications in pressure instruments such as pressure gauges, pressure transmitters and pressure switches and others.

Valve and 5 Valve Manifold are ideal for applications in differential pressure instruments such as differential pressure transmitters, differential pressure switches, differential pressure gauges, etc.

3 Valve Manifold, the most commonly used manifolds, could be provided with test ports on the process side and drain ports on the instrument side for draining of the process and instrument lines respectively.

Valve Manifold is suitable for applications with differential pressure instruments where drain valves are required on the instrument side.
Further, they are used for flushing of the system and for prevention of loss of expensive fluid in the impulses.

"Virgin" makes Manifold Valves which are installed to measure, control, isolate, equalise, calibrate, drain, vent or differentiate the pressure of liquids & gases.
We offer 2, 3, 5 valve manifold configuring remote mounting (pipe to pipe), direct mounting (pipe to flange T type & flange to flange H type) or panel mounting on to gauges, pressure switches or DP transmitters having 54 mm centre .

Two Valve Manifolds

Two Valve Manifold combines isolating, calibrating and venting functions in a single neat unit and is ideal for use on Pressure Gauges, Pressure Switches, Pressure Transmitters, Pressure Controllers and other Pressure Sensitive instruments.

Consequently, using Two Valve Manifold, gives a saving in materials and labour as well as increasing reliability by reducing the number of leak prone joints.

Each unit is tested at 3,000 PSIG hydraulic at ambient temperature. Material of Construction :- Carbon Steel Plated and Stainless Steel.

Three Way Used in conjunction with D/P transmitters, valve manifold is a compact design instrument isolation valves high & low valves and equalizing valves in one block.
Resulting in Lower installation Cost.
Available in carbon steel and stainless steel in following types.

Mounted on impulse line,

Remote from the transmitter.

Five Way

Direct mounting 'H' type manifolds is ideal for stacked assembly between the instrument and the flange process connection.
Co-planar manifolds are designed for direct mounting on to the instrument which help eliminates the adapter plate.

‘T’ type manifolds are designed for direct mounting on the instrument and are connected with screwed process connections.

Remote Mounted from the transmitter Manifolds are tested to 400 kg. / CM2
Hydraulic pressure and for seat at 80 PSIG Pneumatic.
Material of Construction
Carbon Steel and Stainless Steel
end connection /2" NPTF or as per specifications
Five Valves Manifolds can be supplied
Direct Mounted on D/P transmitter in "T" and "H" type

"ASIAN Industrial Valves And Instruments" manufactures ASVIN Bellows Seal Valves include a formed bellows welded to the stem on one side and to the bottom of the bonnet at its bottom end, creating a tight seal.
Bellows are available in many materials for most corrosive chemical applications.

In applications where total containment of toxic media is mandatory, ASVIN Bellows Seal Valves carry a maintenance-free guarantee of 5,000 cycles, and a higher cycle life of 10,000 cycles is available on request.

The valve line is offered in stainless steel 316L as the basic material configuration; however, for severe service and corrosive applications, exotic materials like duplex, super duplex, Hastalloy-C22 and Titanium are also available.

ASVIN Bellows Seal Globe Valves have been reliably in service in nuclear, power and chemical plants for more than 35 years. Differences between conventional globe valves and bellow seal globe valves

ASVIN Bellows Seal Globe Valve has superior sealing performance and is more efficient to guarantee the security of pipelines with hazardous media.

The conventional globe valve is sealed by packing and has the valve stem not in tight contact with packing, causing high leak rates under low temperatures.

The Bellow Globe Valve, in general, is used for pipelines of permeable media such as ammonia since the pipeline will leak only if bellows in seal globe valve are broken.

NDT Testing

Forgings shall be ultrasonically examined to rule out the presence of defects as per ASME B 16.34.
Lip seal welds and hard facing deposit shall be subjected to DP Test as per ASTM E 165 and the acceptance criteria shall be as per ANSI B 16.34.

A flush tank valve is used to drain tanks completely in those situations where it is not feasible to shape the tank bottom to include a gravity drain point.
Most tanks can have a sloped bottom so that all sludge/sediment and product can be drained.
Tanks of this type have dead volumes which cannot be stirred and product cannot be circulated.
These operating restrictions make this style of tank construction unsuitable for hygienic and biotechnology applications.
Equipment must be designed to allow all product to circulate freely and pockets, where the consistency may vary from the bulk, must be eliminated.
Flush tank valves are designed to be fabricated into tori spherical dished ends or circular shells.
The complete contents of the tank can be drained without inhibiting the internal flow patterns.

The valve body can be flanged to bolt to a facing fabricated into the tank.
Alternatively, the valve body can be shaped and weld prepared, or weld prepped, for butt welding into the shell.
The most popular valve types are piston type sample valves.
Care must be taken because of the very close clearances between the piston and the body.
The valve has an extremely poor tolerance to pipe strain and imposed forces and moments and so the design of the outlet pipe is critical.

The standard valve manufactured in AISI 316L to ASME VIII Division 1 requirements. Full material traceability is maintained.
The valve body is designed for direct fabrication into the tank bottom.
Sizes cover DN15 to DN100 outlets.

ASVIN Diaphragm Valves are designed and manufactured according to BS 5156.
They are extensively used in water treatment plants, fertilizer & petrochemical industries, chemical process units, refineries and power plants.
They are suitable for positive pressure and high vacuum applications.
Due to wide range of material options, it is suitable to handle almost all applications within its pressure- temperature limitations.

Total wet area and working parts are isolated from the working media by suitable lining with various qualities of Rubber, PTFE/PFE etc. ensures handling of highly corrosive fluids in efficient and safer manner.

The diaphragm valve is different from all the valves previously described because the bonnet and the stem are always completely isolated from the product.
A diaphragm valve is almost equivalent to a bellows sealed linear valve.
The diaphragm fulfils two functions.
Firstly, it separates the inlet from the outlet when the valve is closed and secondly it separates the operating mechanism from the product.
The diaphragm forms a part of the pressure containment.

The diaphragm is clamped between the body and the bonnet.
Bolted bonnets are standard.
No packing box is required.
The bonnet has an inside rising screw.
Which can have a sealed lubrication reservoir.
A shield on the handwheel is sealed by a lip seal to prevent ingress of moisture or dust into the thread area.
The Operating mechanism is sealed both ways for long life.
Valve maintenance is easy once the line is depressurized and all parts can be removed from under the bonnet.

Valve shut-off capabilities are excellent because of the elastomer diaphragm.
Solids handling is quite good, with 15% maximum recommended concentration.
Diaphragm valves are a sensible choice for hazardous fluids because there is no packing box to worry about.
Routine diaphragm maintenance will ensure almost total containment and diaphragm life can be optimized by the fitting of limit stops to the actuator.
Over-tightening is eliminated thus reducing stresses in the elastomer.
The Precise level of containment is dependent upon the fluid.
Elastomers are permeable; Although permeation through a diaphragm should be considerably less than the leakage through any packing box.
Diaphragm valves are used on hydrogen services, and containment must be good.

The diaphragm is the main limiting restriction on operational parameters.
To widen the range as much as possible a broad selection of materials is used.
Materials are also combined to improve flexibility and chemical resistance.

Maintenance of these Valves are made very simple.
By dismantling the Bonnet from the Body, the entire Trim Assembly can be taken out for maintenance and the Body remains in the Pipeline.
Thus, the design permits online maintenance and saves time and energy.
It has linear flow characteristics, which makes it well suited to throttling or modulating duties.
On/off and control automation is provided with Pneumatic Actuators or Cylinders.

Diaphragm Valves are available in varied material like Cast Iron, S.G. Iron, Cast Carbon Steel, Stainless Steel of all grades, High Alloy Steels like Ally-20, CD4MCu., Hastelloy etc.
Manufacturing range starts from 15NB through 200NB and pressure rating in ANSI 125/150#.