Procurement | Ital Best Valve s.r.l.

Procurement

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A wide range of our products

Italbest Valve can supply engineering documentation, drawings, layouts, general arrangements for different products like:

1. pressure vessels and their internal;
2. gas treatment plant;
3. skid mounted;
4. flanges;
5. fittings;
6. dismantling joints.

ItalBest Valve Engineering develops and designs all products according to the required last edition of the standards with the support of the latest CAD-CAM equipment and 3D dimensional programs; the analysis of each component is just one of the many Design Verification we perform in order to meet specific client requirements.

Our mission is to give our support in the supply chain, as specialists in design and to perform engineering evaluations of materials. We are fully involved in the success of all production challenges and participate in the interaction with specialists in order to satisfy the client.

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Fittings

Fittings are element used to change direction in a pipe system, to connect and joint piping and/or equipment, and to block or regulate flow.

The most used materials and specifications for the fittings are:

– Nickel and Nickel Alloys: ASTM B-366 and ASME SB- 366;
– Stainless Steel: ASTM A-403 and ASME SA-403;
– Chrome-molybdenum: ASTM A-234 and ASME SA-234

To determine the use of a pipe fitting, the size is very important. Such us the inside diameter and the outside diameter; the inside diameter of the fitting size must be the same with the inside diameter of the connecting line, while the outside diameter has to match to the outside diameter of the line. 

As in valves and pipes, fittings must be conformed to pressure classes and temperature; both parameters factors are very important to determine the safe and effecting work of the fitting. The range of temperature and pressure depends on the final application, material being used etc.

As for valves and every other plumbing component, every different type of fittings makes a differet role in the pipeline:

Fittings installed between two lengths of a pipe in order to allow a change of direction, usually with a 90° or 45° angle;

Union fittings are used for an easy disconnection of pipelines in case of maintenance.

Fittings that allow to change the pipe size in order to meet the hydraulic flow requirements on the pipeline

Short pieces of pipes that connect one fitting to the other

Flanges

A flange is an external ridge used to be connected to other elements, for example we can find flange on the end of a pipe, valve and many more applications.
The flange can be a plate or a ring that forms a rim on the end of a pipe when is fastened to it. A blind flange is a plate for cover or close the end of a pipe. A flange joint is a connection of pipes, where the connecting pieces have flanges at their ends and those are bolted together.

To allow easy functionality, flanges are designed to have standardised dimensions. There are many different flange standards.

Therefore common world standards include ASME/BS/DIN, many of the flanges in each standard are divided into pressure classes, allowing them to be capable to tolerate different pressure ratings (the most common pressure classes (ANSI/ASME) are 150#, 300#, 400#, 600#, 900#, 1500#, and 2500#). However, these classes do not correspond to a maximum pressures according to psi unit and the maximum pressure depends on the material of the flange and on the temperature. For example, the maximum pressure for a Class 150 flange is 285 psi, and for a Class 300 Flange it is 740 psi (both are for ASTM A105 Carbon Steel and temperatures below 100F). 

Pipe flanges are manufactured in all different materials such as special steel, stainless steel, cast iron, aluminium, brass, bronze, plastic etc. therefore the most used material is forged carbon steel with machined surfaces. A flange is usually of the same material as the pipe.

The most used flange types are: Welding Neck, Socket Weld and Blind flanges.

Welding Neck Flanges are easy to recognize due the long neck which provides an important reinforcement in order to be used in several applications involving high pressure, sub-zero and elevated temperatures.

Welding necks is designed in conformity to the requirements of the latest ASME Boiler and Pressure Vessel Code. They are made in Carbon, Alloy, Stainless steel from 150 Lb to 2500 Lb, raised face or ring jointed. Welding necks are used primarily for outlets on pressure vessel and tanks; there is a difference between regular welding neck and long welding necks because the longer neck makes the access much easier to the tank or vessel body.

The thickness of the welding edge is calculated to reduce the effects of a shrinkage after the welding which would otherwise be brought about due to differences in the mass of metals. Moreover, having a flanged connection between the vessel and a piping, facilitates the installation and removal of the equipment.

Socket Weld flanges are developed to be used on small-size high pressure piping.

Blind Flanges are manufactured without a bore and are used to close the ends of piping, Valves and pressure vessel openings. For that reason blind flanges, particularly in the larger sizes, are the most highly stressed flange types.

Dismantling Joint

The Dismantling Joints are double flanged fittings that accommodate longitudinal adjustment and can be locked at the required length with the tie bars supplied.
Dismantling Joints play a decisive role in the design and layout of pipelines and valves, because they facilitate the easy access and removal of equipment when it comes to long-term maintenance of piping systems. Rather than moving large sections of fixed pipework, it can be used to create space and easy access to pumps, valves and flowmeters. Moreover, this system simplifies future pipe work modifications and reduces downtime when changes need to be made, allowing high efficiency.
Thanks to this adjustability of the product, the valve can be fitted next to the dismantling joint, and it can be to set to the exact length required prior to being securely connected to flanges.
Certain types of dismantling joints are also suitable for use without restraint in flexible pipelines or where a pump installed in a fixed position has to be connected to a pipe protruding from a wall
A wide range of this product is available: from DN40 (1½”) to DN2400 (96”), although larger sizes and custom-made Dismantling Joints can be designed and built on request.

Gate Valves

ItalBest Valve srl offers a complete range of gate valves for high pressure and low/high temperature applications, proven by several years of service in thermal and nuclear power plants, as well as in other high-pressure steam services and hydrocarbon processing services.

Gate valves are commonly used in power plants, water treatments, mining and offshore applications.

This product has been designed to reduce pressure drop when the valve is fully opened until the fluid flow, which direction doesn’t change, is completely stopped.

This kind of valve operates using the wedge, which can be either round or rectangular. The characterizing feature of a gate valve regards the sealing surfaces between gate and seats, which are flat. That’s why gate valves are often used when a linear flow is desired.

This allows gate valves to have minimal obstacle to the flow, creating less turbulence within the structure.

When the valve is completely open, the wedge is lifted entirely out of the waterway, providing a fully passage through the body.

Gate valves consist of three main parts: body, bonnet, and trim. The body is generally connected to other components by flanged, screwed or welded connections. The bonnet, which contains the moving parts, is connected to the body, usually with bolts, in order to allow an easy maintenance. The valve trim consists on stem, gate, disc or wedge and seat rings.

For a valve of the Rising Stem type, the stem will rise  above the hand wheel if the valve is opened. This happens,  because the stem is threaded and mated with the bushing  threads ofa Yoke. A Yoke is an integral part from a Rising  Stem valve and is mounted to the Bonnet.

For a valve of the non Rising Stem type, there is no upward stem movement if the valve is opened. The stem is threaded into the disk. As the hand wheel on the stem is rotated, the disk travels up or  down the stem on the threads while the stem remains vertically stationary.

Check Valve

Check Valves are “automatic” valves that open during forward flow and close during reverse flow. The pressure of the fluid, passing through a system, opens the valve, while any reversal of flow closes the valve.
The operation will vary depending on the type of check valve mechanism.
This product is used to prevent the reversal of the flow. When the valve is opened and under flow pressure, the checking mechanism will move freely in the middle, offering very little resistance and minimal pressure drop.
Generally, check valves are smaller in size and easier to install than other valves, assuring an easier and more efficient maintenance.
The construction consists on a valve body, bonnet or cover, and a disc which is attached to a hinge and swings away from the valve seat to allow fluid to flow in the forward direction, and returns to the valve seat when upstream flow is stopped. Thus, reverse flow is prevented. In folding disc check valves, the disc consists of two halves attached in the middle. These two halves fold backward, when upstream flow is initiated. Activated by a spring, the two halves quickly close the flow path. In the case of lift-check valves, the disc is in the form of a piston which is moved out of the flow path by upstream flow and returns to the valve seat by gravity to stop back flow. Ball-check valves have a disc in the form of a ball.
Check valves are available in sizes from NPS ¹⁄₄ (DN 6) through NPS 72 (DN 1800). Other sizes may be made available to meet specific size requirements. Depending upon the design requirements of a piping system, a check valve may have butt welding, socket welding, threaded, or flanged ends.

  • Chemical Processing
  • Bleach Plants
  • Aquariums
  • Mining
  • Water Treatment
  • Landfills
  • Swimming Pools
  • Power Plants
Globe Valve

Globe valves is a type of product used to stop and regulate the flow in a pipeline. it consist of a movable disk-type element and a stationary ring seat in a generally spherical body.

Conventional Globe valves may be used for isolation and throttling services. Because the entire system pressure exerted on the disc is transferred to the valve stem, the practical size limit for these valves is NPS 12(DN300); larger valves would require that enormous forces be exerted on the stem to open or close the valve under pressure.

This product is employed to control flow. The range of flow control, pressure drop and duty must be considered in the design of the valve to avert premature failure and to assure satisfactory service. Valve subjected to high-differential pressure-throttling service require specially designed valve trim.

There are three primary body designs for globe valves: tee pattern body (or Z-body), angle pattern body and wye pattern body.

Talking about valve construction, this type of valve has seats in a plane parallel or inclined to the line of flow.

Maintenance of this product is relatively easy, as the disk and the seats are readily replaced. This makes the valve particularly suitable for services which require frequent maintenance. Moreover, where valves are opened manually, the shorter disc travel offers advantages in saving operator time, especially if valves are adjusted frequently.

For applications with low temperature, globe valves are normally installed so that the pressure is under the disc. This contributes an easy operation and helps to protect the packing. For application with high temperature, Globe valves are installed so that the pressure is above the disk.

Talking about advantages of this type of valves we remember:

  • Good shutoff capability
  • Moderate to good throttling capability
  • Available in tee, wye and angler patterns
  • Easy to machine or resurface the seat
  • Cooling water systems where flow needs to be regulated
  • Fuel oil system where flow is regulated and leak tightness is of importance
  • High-point vents and low-point drains when leak tightness and safety are major considerations
  • Feed water, chemical feed, condenser air extraction, and extraction drain systems
  • Boiler vents and drains, main steam vents and drains, and heater drains
  • Turbine seals and drains
  • Turbine lube oil system and others

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