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Globe Valves

Straight Globe  • Y-Globe • Angle Globe • Y-Angle Globe

Product Range

Straight Globe Valves

Straight Globe Valves

Y-Globe Valves

Y-Globe Valves

Angle Globe Valves

Angle Globe Valves

Y-Angle Globe Valves

Y-Angle Globe Valves

Straight Globe Valves

Straight Globe Valves

Globe valves are used for regulating flows inside of a pipeline. The desired degree of control or regulation, defines the type of valve and if it should be designed with or without cage guiding.
Where the flow conditions and the regulation requirements are not very severe, this valves are supplied without cage guiding, with flat or conical disc. It is important that the disc guiding be in the body or in the seat, in order to obtain trouble free operation without valve seizing and also a good seat tightness.
For applications that require regulation under severe condi- tions and where cavitations or flashing may occur, different type of discs (flat, parabolic, needle, ball) and seats are availa- ble to guarantee the right performances of the valve under each operating conditions.

Design: ASME B16.34, BS 1873

 

Code 12

Type: Globe
Bonnet: Bolted 
Sizes: 1/2″- 48″
ANSI Class: 150-2500
Other codes: 32 Needle 

Code 17

Type: Bellows Seal Globe
Bonnet: Threaded & Welded 
Sizes: 1/2″- 3″
ANSI Class: 150-1500
Other codes: 37 Bellows Seal Needle 

Code 15

Type: Globe
Bonnet: Pressure Seal 
Sizes: 2″- 24″
ANSI Class: 600-4500
Other codes: 35 Needle 

Code 78

Type: Bellows Seal Globe
Bonnet: Bolted 
Sizes: 1/2″- 24″
ANSI Class: 150-1500

Code 11

Type: Globe
Bonnet: Threaded & Welded 
Sizes: 1/2″- 3″
ANSI Class: 150-4500
Other codes: 38 Needle 

Code 13

Type: Cryogenic
Bonnet: Bolted 
Sizes: 1/2″- 48″
ANSI Class: 150-900

Y-Globe Valves

Y-Globe Valves

Among the diferent functions of this type of valve, most relevant aplication is as feed water stop valve, used to protect the water piping between the economizer and the feed water heaters during the hydrostatic boiler test.
These valves are also applicable wherever large volumes of fluid have to be handled at high pressure and/or high temperatures, handling steam and water at aceptable velocities and pressure drops.

Design: ASME B16.34, BS 1873, ISO 15761

 

Code 72

Type: Y-Globe
Bonnet: Bolted 
Sizes: 1/2″- 24″
ANSI Class: 150-900

 

 

Code 75

Type: Y-Globe
Bonnet: Pressure Seal 
Sizes: 2″- 24″
ANSI Class: 600-4500
Other codes: 16 Y-Needle 

Code 77

Type: Bellows Seal Y-Globe
Bonnet: Threaded & Welded 
Sizes: 1/2″- 3″
ANSI Class: 150-600

Code 71

Type: Y-Globe
Bonnet: Threaded & Welded 
Sizes: 1/2″- 3″
ANSI Class: 150-4500
Other codes: 31 Y-Needle
Other codes: 34 Option Ø Lekeage

DESIGN FEATURES

  • Low pressure drop.
  • Excellent resistance to thermal changes.
  • Quick and easy repair in the line.
  • Seat integrally stellited.
  • Disc fully guided.
  • Renewable disc guide bushing.
  • Drop-tight shut-off.
  • Pressure seal design with clamp, easy to disassemble.

Angle Globe Valves

Angle Globe Valves

Babcock Valves’ angle globe valves are used for many different aplications where stop or regulating of fluid is required under high pressure and/or temperature conditions.

Design: ASME B16.34, BS 1873

Code 92

Type: Angle Globe
Bonnet: Bolted
Sizes: 2″- 48″
ANSI Class: 150-900
Other codes: 98 Needle 

Code 95

Type: Angle Globe
Bonnet: Pessure Seal
Sizes: 2″- 48″
ANSI Class: 600-4500
Other codes: 96 Needle 

Code 91

Type: Angle Globe
Bonnet: Threaded & Welded
Sizes: 1/2″- 3″
ANSI Class: 150-4500
Other codes: 93 Intermitent / Continuous Blow Down Valve

DESIGN FEATURES

  • Allows installation in any position.
  • Positive shut-off.
  • Disc guiding.
  • Stellited disc, seat and backseat.
  • Welded or integral seat and/or backseat construction. • Streamlined body flow areas.
  • Stem guide collar to prevent stem rotation and serve as indicator for open and close position.
  • Pressure seal design with clamp, easy to disassemble.

Y-Angle Globe Valves

Code 14

Type: Y-Angle Globe
Bonnet: Pressure Seal
Sizes: 2″- 24″
ANSI Class: 600-4500

Y-Angle Globe Valves

Babcock Valves’ Y-Angle globe valve (also called elbow-down) is used at the discharge of circulating pumps on controlled circulation boilers.
Located at the inlet of the vertical discharge line, the valve shall work as a shut-off globe valve.
This design includes all advantages of a Y-body permitting at the same time the elbow outlet connection to the vertical line.

ASME B16.34, BS 1873

 

DESIGN FEATURES

  • Low pressure drop.
  • Excellent resistance to thermal changes.
  • Quick and easy repair in the line.
  • Equalizer increases disc lift.
  • Seat integrally stellited.
  • Disc fully guided.
  • Renewable disc guide bushing.
  • Drop-tight shut-off.
  • Pressure seal desing with clamp, easy to disassemble.
  • Narrow tapered cone seat faces.
  • Stem guide collar to prevent stem rotation.
  • Impact gear operator with heavy weight construction.
  • A portable air wrench operating from 90 psi plant compressed air supply turns the valve stem.
  • Combined radial and thrust berings transmit heavy opening and closing loads.

Types of disc

Globe valves can be supplied with four types of disc depending on the application.

Each type shall allow a different grade of control over the circulating fluid. The right combination of a type of disc and material of construction and hardfacing, will minimize wear caused by cavitation in severe applications.

DISC FUNCTIONALITY

The chart shows the stem opening related to the quantity of flow provided. It indicates as well the grade of control over the fluid between the different type of disc that we can supply.

PLUG TYPE DISC

The disc has a flat finished, being the most normal globe disc type, as well as simple and economical. Designed to permit flow passage or flow stop without regulation. Therefore, it is normally used for positive shut off service.

BALL TYPE DISC

Lower half of the disc has a ball shape, permitting flow passage and flow stop, having the possibility to control partia- lly the flow mainly in low pressure service.

NEEDLE TYPE DISC

With the needle disc design the flow rate is better controlled than other disc designs and a fine regulation is got.

PARABOLIC TYPE DISC

It is similar to the ball type disc, but its parabolic design provides a higher flow regulation, having a better behavior against wear.

Types of Bonnet

Bolted Bonnet

The most common connection between valve body and bonnet for ASME ratings up to 600.

 

Under demand, it can be also used for high pressure applications up to class 2500.
The Babcock’s strong designs and a precision machining of bodies and bonnets shall guarantee the best performances of the valves during operation.
The right sealing between body and bonnet is made by designing a more than sufficient type and number of bolts, and selecting the best gasket for each service.
There are different joint / gasket designs for each applicable ASME rating. A flat oval gasket is normally used for low pressure (class 150) and a spiral wound gasket for intermediate pressures (class 300) and high pressure (class 600). Other type of joints as corrugated or ring type are also available under demand.

NOTE:
For Class 900 and superior, the Bolted Bonnet gasket used is RTJ.

STANDARD BOLTED BONNET GASKETS

Class 150

Detail for
FLAT GASKET

Class 300

Detail for
FLAT GASKET

Class 600

Detail for
FLAT GASKET

Pressure Seal

Pressure seal bonnets allow high pressure service, typically in excess of 15 Mps (2250 psi).

 

The main feature about the pressure seal bonnet is that the body-bonnet joints seals improves as the internal pressure in the valve increases, compa- red to other constructions where the increase in internal pressure tends to create leaks in the body-bonnet joint.
The basic operation of this kind of valve, where the seal is achieved from the pressure exerted by the fluid flowing trough the valve, is as follows:
Internal pressure forces the bonnet upwards against the gasket, creating forces in the contact areas between the gasket and the bonnet and between the gasket and the body.
Leaks most commonly arise at the contact surface between the gasket and the body. The area where the body is in contact with the joint is covered by stainless steel, improving surface’s quality and avoiding corrosion issues.
Gaskets are carefully designed to produce a tight seal regardless of the line conditions, that can be easily dismantled for maintenance operations.

GENERAL DESCRIPTION

The basic operation of this kind of valve, where the seal is achieved from the pressure exerted by the fluid flowing through the valve, is as follows:
Fig. 1
Forces making the seal

Internal pressure forces the bonnet upwards against the gasket creating forces in the areas of contact between the gasket and the bonnet (disc shaped area). and between the gasket and the body (valve passage area). See (Fig. 1 ). The quality of the seal between the surfaces depends upon two basic considerations, these being the surface quality of the areas in contact, and the degree of force (load per unit area) which holds them together.

It is easier to achieve the seal from the two gasket surfaces where a seal is made (gasket-bonnet and gasket-body) in the gasket bonnet contact area, in comparison to the larger component of the force exerted by the pressure inside, and it is more than sufficient to provide a tight seal.

Leaks most commonly arise at the contact surface between the gasket and the body. The .area where the body is in contact with the joint (Fig. 2) is covered with stainless steel, and this improves surface quality and avoids corrosion problems. The force actuating between the contact joint body surfaces is the horizontal component of force perpendicular to the contact surfaces between the bevelled surfaces of the joint and bonnet. The efficiency of the seal between the gasket and body is determined basically by the gasket angle, which in turn determines the horizontal force component that will act upon them. The smaller the gasket angle, the greater the horizontal component is, and hence, the harper the angle on the bevelled surface, the greater the horizontal component, and the better the seal.

Fig 2

 

Fig. 3
Angle 25º

A gasket designed with a 25° angle (Fig. 3) will turn into radial force, a greater component of the force exerted by the pressure from the line on the bonnet, than a gasket designed with an angle of 30° 45° (Fig.4). Moreover, in order to achieve large unitary loads, the surface upon which the force is exerted may be reduced, with checks being performed to ensure that the surface is sufficient to support the load without cracking.

When a pressure seal joint is required to seal over a large range of pressures, there may be difficulties. A gasket which is sufficiently small so as to seal under a pressure of 500 psi. may not support 2.500 psi.

Fig. 4
Angle 45º

A way to overcome this problem is to design the gasket bonnet contact surfaces to have a difference of one degree between them (Fig. 5).

Fig. 5

Before the gasket is tightened, only its edge is in contact with the bonnet (Fig. 6).

Fig. 6

Under pressure, one part of the gasket will deform and enter into contact with the bonnet (Fig. 7).

Fig. 7

A careful design of the gasket pressure seal angle will prevent those more serious difficulties found with large angle gaskets (30°-45°). With a narrow gasket angle (25°), a tight seal can be achieved by applying little pressure, and once the seal has been made, it will stay tight regardless of line conditions. Certain tests performed with narrower gaskets (15°-20°), showed that the seal became so tight that it was impossible to remove the gasket. A gasket of approximately 25° is found to produce a seal that can be easily dismantled.

Threaded & Welded

The double sealed design.

 

Unlike the bolted bonnet and pressure seal body-bonnet closure systems, the threaded & welded system consists of a double-sealed design, first by threading the bonnet-yoke to the body, and second by sealing it by means of a welding seam.
The necessary non destructive tests are carried out to ensure a perfect sealing.
Under demand, a sealing gasket can also be placed between body and bonnet.
The threaded & welded design is primarily used on small size forged valves up to 2″, and for high pressure ratings, from ASME class 900 to 4500.

Threaded
Welded

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