GB2541404A

GB2541404A - Valve

Info

Publication number: GB2541404A
Application number: GB1514604.6A
Authority: GB
Inventors: Bailey David; Greenwood Steven
Original assignee: Fort Valve Engineering Ltd
Current assignee: Fort Valve Engineering Ltd
Priority date: 2015-08-17
Filing date: 2015-08-17
Publication date: 2017-02-22
Anticipated expiration: 2035-08-17
Also published as: GB201514604D0; GB2541404B

Abstract

A globe valve 10 comprises a valve body (12, Fig. 2), an inlet port 14 and an outlet port 16 in the valve body, a valve seat 24 located between the inlet port and the outlet port and a valve closure member 28 engageable with the valve seat 24. A portion of an internal wall of the valve body comprises a projection 48 in the form of a ridge which is configured to improve the flow of fluid through the valve body,

Description

VALVE

The present invention rebates to valves. In particular, hut not exclusively, the present invention relates to globe valves and more particularly to cryogenic globe valves. A glebe valve Is a type of valve used for regulating flow. Typically, a globe valve comprises a bulbous valve body having an Inlet and an outlet at opposite ends and a valve seat within the valve body located between the inlet and the outlet, A valve plug is mounted on one end of a valve stem which passes sealingly out of a valve bonnet extending from the valve body. The valve stem is sealed with respect to the valve bonnet by means of a stem packing arrangement. A handwheel is typically secured to the opposite end of the valve stem and the valve slam is screw-threadedly mounted within the valve bonnet so that rotation of the stem by means of the handwheel causes the valve stem to be displaced longitudinally and thereby causes the valve plug to be engaged with, or disengaged from, the valve seat in order to control the flow of fluid through the valve.

Cryogenic globe valves are provided with a valve bonnet of extended length in order to keep the stem packing at a sufficient distance from the cold fluid passing through the valve to remain functional

In accordance with a first aspect of the present Invention, a valve comprises: (a) a valve body; (b) an inlet port and an outlet port in the valve body; (c) a valve seat located between the inlet port and the outlet port; and (d) a valve closure member raieasahly engageable with the valve seat; wherein a portion of an internal wall of the valve body comprises a projection which is configured to influence the flow of fluid through the valve body,

It has been found that the provision of a projection on an internal wall of the valve body can significantly Improve the flow of fluid through the valve as a result of, it is believed, a reduction in rotation of fluid in the valve body.

The valve may comprise a projection on an internal wall of the valve body between the inlet port and the valve seat.

Alternatively, or in addition, the valve may comprise a projection on an internal wall of the valve body between the valve seat and the outlet port.

The valve may comprise an elongate projection.

There may be a projection beneath or opposite the valve seat.

The valve as may further comprise a valve stem on which the vaive closure member is mounted, a bonnet extending from the valve body, in which the valve stem is located and from one end of which the valve stem projects, and a projection on an Internal wall of the valve body on the opposite side of the valve body from the bonnet.

There may be a projection disposed symmetrically with respect to the valve body.

There may be a projection disposed centrally with respect to the lateral sides of the valve body.

The valve may comprise an elongate projection which may, for example, be aligned with the flow of fluid through the valve.

The valve may comprise a plurality of projections.

There may be one or more projections between the inlet port and the valve seat.

Alternatively, or in addition, there may be one or more projections between the valve seat and the outlet port.

The vaive may comprise a globe vaive, e.g. a cryogenic globe valve.

By way of example only, a specific embodiment of the present invention will now be described, with reference to the accompanying drawings, in which:

Fig 1 is a perspective view of an embodiment of cryogenic globe valve in accordance with the present Invention;

Fig 2 is a side view of the valve of Fig 1;

Fig 3 is an end view of the valve of Fig 1;

Fig 4 is a vertical cross-section through the valve of Fig 1 shown In a closed condition, looking in the direction of arrows C~C in Fig 3;

Fig 5 Is a vertical cross-section through the vaive of Fig 1 shown in an opened condition, looking in the direction of arrow's C-C in Fig 3;

Fig 8 is an enlarged perspective view of the valve housing of the valve of Fig 1;

Fig 7 is an enlarged end view of the valve body of Fig 8, looking at the opposite and to that of Fig 3;

Fig 8 is a plan view of the vaive housing of Fig 8; and

Fig 9 is a vertical cross-section through the valve housing of Fig 8, looking in the direction of arrows A-A in Fig 7,

Referring firstly to Figs 1 to 5, a cryogenic globe valve 10 comprises a valve body 12 having an inlet pod 14 and an outlet port 16, an elongate valve bonnet 18 extending from the top of the valve body and a handwheel 20 at the upper end of a valve stem 22 projecting from the valve bonnet 16, As shown in Figs 4, 5 and 9, an annular vaive seat 24 is located within the valve body 12 between the inlet 14 and outlet 18 and a valve clesure member in the form of a valve plug 28 is movable Into and cut of sealing engagement with the valve seat 24 by suitable rotation of the handwheel 20, as will be explained.

The top of the valve body 12 is formed into a planar bonnet mounting face 27 and abuts the planar face 28 of a bonnet mounting flange 30 at the lower end of the vaive bonnet 18. The valve bonnet IB is secured to the valve body 12 by means of four identical parallel bolts 32 passing through four aligned apertures 33 in the bonnet mounting flange 30 and in the bonnet mounting face 2B of the valve body 12,

The elongate valve stem 22 extends through the valve bonnet 18, as shown in Figs 4 and 5. The valve plug 28 is secured to the inner end of the valve stem 22 and carries an annular deformable seal 34 for engagement with the valve seat 24. The valve stem 22 passes saalingly out of the valve bonnet 18 by means of a peeking arrangement comprising a seal 38, a seal retaining collar 38 and a stuffing nut 4G at the cuter end of the valve bonnet 18, and the handwheel 20 is attached to the outer end of the valve stem by means of a lock nut 42,

As best seen in Figs 4 and 5, the portion 44 of the valve stem immediately above its Inner end is screw-threaded and is received in a complementarily threaded collar 48 which forms the inner end of the valve bonnet 18, Rotation of the valve stem 22 by means of the handwheel 20 thereby causes the valve stem 22 to move along its longitudinal axis, by means of which the valve plug 28 can be seated on the valve seat 24 (see Fig 4} or displaced from the valve seat (see Fig 5), Figs 4 and 5 show the two extreme positions of the valve 26, but the valve stem 22 may be rotated to locate the valve plug between the two extreme positions.

As shown In the drawings, an inlet passage is formed within the valve body 12 between the inlet port 14 and the valve seat 24 and an outlet passage is formed ‘within the valve body between the valve seat and the outlet port 18, The inner wall of the inlet passage of the valve body 12 between the inlet port 14 and the valve seat 24 is formed info a projection in the form of a ridge 48 at a location on the opposite side of the valve body from the valve bonnet 18 and directly beneath and opposite the valve seat 24, and is also visible on the exterior of the undersurface of the valve body as an elongate indentation 50. The ridge 48 extends In the direction of flow of fluid between the inlet 14 and the valve seat 24 and is located centrally within ihe valve, aligned laterally and symmetrically with the longitudinal axis X-X of the valve (see Fig 8),

The cryogenic globe valve is operated In the conventional manner, by rotating the handwheel 20 in order to engage the valve 26 with, or to disengage it from, the valve seat 24 in order to control the flow of fluid through the valve, However, it has been found that the provision of the ridge 48 significantly improves the flow of fluid through the valve, and it is believed that this is as a result of a reduction in rotation of fluid in the valve body.

The invention is not restricted to details of the foregoing embodiment.

For example, the number, shape and location of the ridged projection 48 may differ from that described in the above embodiment. However, the projection or projections are in each case configured to influence the flow of fluid through the valve.

There may be more than one projection, the shape of the projection may differ from that in the above embodiment (e.g. the projection might not be elongate) and the position of the or each projection may differ from that of the ridged projection 48 in the above embodiment

There may be one or more projections on the inner wall of the outlet passage of the valve body 12 between the valve seat 24 and the outlet post 18 in addition to, or instead of, one or more projections on the inner wall of the inlet passage of the valve body 12 between the inlet port 14 and the valve seat 24,

Claims

1. A valve comprising: (e) a valve body; (f) an inlet port and an outlet port in the valve body; (g) a valve seat located between the inlet port and the outlet port; and (h) a valve closure member releasably engageable with the valve seat; wherein a portion of an internal waii of the valve body comprises a projection which is configured to Influence the flow of fluid through the valve body.

2. A valve as claimed In claim 1, comprising a projection on an internal wait of the valve body between the inlet port and the valve seat.

3. A valve as claimed in claim 1 or claim 2, comprising a projection on an internal wall of the valve body between the valve seat and the outlet port.

4. A valve as claimed In any of the preceding claims, comprising an elongate projection.

5. A valve as claimed in any of the preceding claims, comprising a projection beneath or opposite the valve seat,

8, A valve as claimed In any of the proceeding claims, further comprising a valve stem on which the valve closure member is mounted, a bonnet extending from the valve body, in which the valve stem is located and from one end of which the valve stem projects, and a projection on an internal wall of the valve body on the opposite side of the valve body from the bonnet >\ A valve as claimed in any of the preceding claims, comprising a projection disposed symmetrically with respect to the valve body,

8. A valve as claimed in any of the preceding claims, comprising a projection disposed centrally with respect to the lateral sides of the valve body.

9. A valve as claimed in any of the proceeding claims, comprising an elongate projection.

10. A valve as claimed in claim 9, wherein the projection is aligned with the flow of fluid through the valve.

11. A valve as claimed in any of the preceding claims, comprising a plurality of projections.

12. A valve as claimed in any of the preceding claims, comprising one or more projections beiween the Inlet port and the valve seat.

13. A valve as claimed in any of the preceding claims, comprising one or more projections between the valve seat and the outlet port.

14. A valve as claimed in any of the preceding claims, wherein the valve comprises a globe valve.

15. A valve as claimed in claim 14, wherein the valve comprises a cryogenic globe valve.

10, A valve substantially as herein described with reference to and as illustrated in the accompanying drawings.