GB2287772A - Gate valve stem sealing arrangement - Google Patents

Gate valve stem sealing arrangement Download PDF

Info

Publication number
GB2287772A
GB2287772A GB9402455A GB9402455A GB2287772A GB 2287772 A GB2287772 A GB 2287772A GB 9402455 A GB9402455 A GB 9402455A GB 9402455 A GB9402455 A GB 9402455A GB 2287772 A GB2287772 A GB 2287772A
Authority
GB
United Kingdom
Prior art keywords
gate valve
packing
rings
valve
sealing arrangement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9402455A
Other versions
GB9402455D0 (en
Inventor
Raymond George Coughlin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB9402455A priority Critical patent/GB2287772A/en
Publication of GB9402455D0 publication Critical patent/GB9402455D0/en
Publication of GB2287772A publication Critical patent/GB2287772A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K41/00—Spindle sealings
    • F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
    • F16J15/20—Packing materials therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Valves (AREA)

Abstract

A sealing arrangement for the stem of a gate valve comprises a packing having carbon braided wiper rings 2, 4 and graphite formed sealing rings 3. A load is applied to the packing by a disc-spring arrangement 2, 4. The rings of the packing may have different densities. The rings may be formed by pressing in a die using a hydraulic press. Tests on such a sealing arrangement in a valve rated at 150 psi (1.0MPa) and pressurised to 1800 psi (12.4MPa) did not show any leakage. The sealing arrangement is suitable for valves used in paper mills, ships, oil refineries and steam generators. <IMAGE>

Description

BAY VALVE This invention relates to the stuffing box packing and the action of disc springs to compress the packing on gate valves.
The traditional gate valve has a braided type or asbestos packing in the stuffing box which is held captive by a retaining plate.During use the valve leaks through the packing on average every 6 months.
The new type of packing is under a constant load so as the wear takes place,pressure on the packing causes the re-sealing of the packing stopping the leak.
The packing put into the valve involves graphite die formed rings of specific densities,with carbon braid to act as a wiper.
A keep plate is bolted to the top of the valve with a constant load on the rings and packing by use of disc springs.
The ammount of disc springs,arrangement and specific details depend on the size of the valve.
The specific details of the invention are described by way of example,with reference to accompanying sketches.
Fig.l. VALVE OUTLINE Fig.2. PACKING A2JD DISC SPRING ARRANGEMENT The sketches are relating to the top half of the valve as the main construction of the bottom half is typical (i.e.a nominal bore flange with drillings to Bs 10 table e)STANDARD PITCH.
The top half of the valve shown in the sketches is new.This comprises of a cast iron body designed to the specific requirements of the valve along with the packing and disc spring arrangement.
A new valve stem or modification to the existing stem must take place prior to the assembly of the valve.
To inspect the condition of the packing the top keep plate can be removed.
To dismantle the valve all the springs must be removed and this is the required method to change the disc springs at the end of their service life.

Claims (4)

1. A gate valve of this type with die cast rings,braided carbon packing under load by disc springs will cut down on maintenance "Down Time"as any adjustments in the disc springs tensions will control the radial expansion.
2. A gate valve as in claim 1 using the graphite rings will have less friction on the valve stem and be subject to less wear due to the graphite proportions.
3. A gate valve as in claims 1/2 has unlimited pressure capabilities subject to the rating on the valve body.
4. A gate valve as in claims 1/2/3 will reduce process and maintenance cost through increased operational efficiency.
GB9402455A 1994-03-10 1994-03-10 Gate valve stem sealing arrangement Withdrawn GB2287772A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9402455A GB2287772A (en) 1994-03-10 1994-03-10 Gate valve stem sealing arrangement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9402455A GB2287772A (en) 1994-03-10 1994-03-10 Gate valve stem sealing arrangement

Publications (2)

Publication Number Publication Date
GB9402455D0 GB9402455D0 (en) 1994-03-30
GB2287772A true GB2287772A (en) 1995-09-27

Family

ID=10750093

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9402455A Withdrawn GB2287772A (en) 1994-03-10 1994-03-10 Gate valve stem sealing arrangement

Country Status (1)

Country Link
GB (1) GB2287772A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997035129A1 (en) * 1996-03-22 1997-09-25 Garlock, Inc. Compact five ring stuffing box packing assembly
GB2347196A (en) * 1999-02-27 2000-08-30 Oliver Valves Ltd Ball valve spindle sealing
US6182974B1 (en) 1996-03-22 2001-02-06 Garlock, Inc. Stuffing box packing assembly
WO2001036854A1 (en) * 1999-11-15 2001-05-25 Garlock, Inc. Forged valve stem packing set
WO2003104697A1 (en) * 2002-06-06 2003-12-18 Ingenieria Y Servicios Del Bidasoa, S.A.L. Impervious closure for powdered products
US8371519B2 (en) 2009-04-17 2013-02-12 Garlock Sealing Technologies Llc Stem packing dispenser
RU2491463C1 (en) * 2012-08-20 2013-08-27 Закрытое акционерное общество "УНИХИМТЕК" (ЗАО "УНИХИМТЕК") Method of making sealing ring and sealing ring
CN103759012A (en) * 2014-01-23 2014-04-30 章华 Low-leakage composite forming flexible graphite padding

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104455440B (en) * 2013-09-16 2017-10-20 进典工业股份有限公司 Has the seal ring as stuffing-box of toughness

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2162617A (en) * 1984-08-02 1986-02-05 Rockwell International Corp Valve stem seal
GB2195153A (en) * 1986-07-30 1988-03-30 Klinger Ag Packing materials for shaft seals
GB2233405A (en) * 1989-06-21 1991-01-09 Triten Corp Stuffing box for pressure vessel or valve
EP0411652A1 (en) * 1989-08-04 1991-02-06 CHEMAT GmbH Armaturen für Industrie- und Nuklearanlagen Valve spindle sealing
GB2255141A (en) * 1991-04-25 1992-10-28 Latty Int Sealing element
US5192049A (en) * 1992-06-12 1993-03-09 Cashco, Inc. Dual rated live loaded packing system for a valve stem
GB2271163A (en) * 1992-10-02 1994-04-06 Latty International Ltd Compressing a valve stem seal

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2162617A (en) * 1984-08-02 1986-02-05 Rockwell International Corp Valve stem seal
GB2195153A (en) * 1986-07-30 1988-03-30 Klinger Ag Packing materials for shaft seals
GB2233405A (en) * 1989-06-21 1991-01-09 Triten Corp Stuffing box for pressure vessel or valve
EP0411652A1 (en) * 1989-08-04 1991-02-06 CHEMAT GmbH Armaturen für Industrie- und Nuklearanlagen Valve spindle sealing
GB2255141A (en) * 1991-04-25 1992-10-28 Latty Int Sealing element
US5192049A (en) * 1992-06-12 1993-03-09 Cashco, Inc. Dual rated live loaded packing system for a valve stem
GB2271163A (en) * 1992-10-02 1994-04-06 Latty International Ltd Compressing a valve stem seal

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997035129A1 (en) * 1996-03-22 1997-09-25 Garlock, Inc. Compact five ring stuffing box packing assembly
US6182974B1 (en) 1996-03-22 2001-02-06 Garlock, Inc. Stuffing box packing assembly
CN1095957C (en) * 1996-03-22 2002-12-11 加洛克公司 Compact five ring stuffing box packing assembly
GB2347196A (en) * 1999-02-27 2000-08-30 Oliver Valves Ltd Ball valve spindle sealing
WO2001036854A1 (en) * 1999-11-15 2001-05-25 Garlock, Inc. Forged valve stem packing set
US6273431B1 (en) 1999-11-15 2001-08-14 Garlock Inc Forged valve stem packing set
WO2003104697A1 (en) * 2002-06-06 2003-12-18 Ingenieria Y Servicios Del Bidasoa, S.A.L. Impervious closure for powdered products
US8371519B2 (en) 2009-04-17 2013-02-12 Garlock Sealing Technologies Llc Stem packing dispenser
RU2491463C1 (en) * 2012-08-20 2013-08-27 Закрытое акционерное общество "УНИХИМТЕК" (ЗАО "УНИХИМТЕК") Method of making sealing ring and sealing ring
CN103759012A (en) * 2014-01-23 2014-04-30 章华 Low-leakage composite forming flexible graphite padding
CN103759012B (en) * 2014-01-23 2016-07-06 章华 A kind of low leakage combination forming filler of soft graphite

Also Published As

Publication number Publication date
GB9402455D0 (en) 1994-03-30

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)