旋启式止回阀安装、操作维护手册

1、SWING CHECKVALVEINSTALLATION,OPERATION ANDMAINTENANCE MANUAL MJ-1720 December 2005M&J Valve19191 Hempstead HighwayHouston, TX 77065Telephone: 281-469-0550, Outside Texas (800 231-3690Fax: 281-894-1332E-Mail: mandjvalveWeb Site: SPX Process Equipment reserves the right to incorporateour latest de

2、sign and material changes without notice orobligation. Design features, materials of construction anddimensional data, as described in this bulletin, are providedfor your information only and should not be relied uponunless confirmed in writing. Certified drawings are availableupon request.Installat

3、ion, Operation, and Maintenance Manualfor M&J Check ValvesI General information1. The M&J swing check valve provides back ow control for piping systems. It is designed, manufactured, and tested in accordance with API-6D Q1 unless otherwise speci ed. The cast body design conforms to ANSI B16.

4、34. Flanged end valve anges are in accordance with ANSI B16.5 (24”and smaller and MSS SP-44 (larger than 24”.2. Carbon steel weld end valves have end connections that are ready to be welded in the field. End preparations match speci ed mating pipe bores. Transition pieces are provided when speci ed.

5、3. Located on the valve cover plate, the nameplate(Figure 1 provides applicable information including size, pressure, class, materials, seals, pressure/temperature, ratings and serial number. Provide the valve serial number when contacting M&J Valve Company in regards to your valve. This will ex

6、pedite any request and insure that correction information is given. Note: The serial number is also stamped on the body near the cover plate joint.1. Unpacking1.1 All valves should be inspected on receipt for lost or damaged components.1.2 Remove end connection protectors and thoroughlyinspect valve

7、 interior for damage and/or foreign material. Remove all shipping supports.1.3 Install all loose items as soon as possible toprevent loss or damage.2. Handling2.1 Small valves may be lifted with slings, straps, orby hooking into end anges. Large valves are furnished with lifting holes in the cover p

8、late. Caution: Always use handling equipment that is suitable for the valve weight. Follow good lifting practices. Take care not to damage valve or component assemblies.II Installation3. InstallationStandard M&J check valves are designed forhorizontal service. When vertical ow is intended, valve

9、s must be specifically ordered for that service. 3.1 For horizontal service, valves should be installedwith the inlet and outlet at the same level. The cover plate should be facing upward to allow proper clapper action. The arrow on the body must be pointing in the direction of intended ow.For verti

10、cal ow up service, install the check valve with the clapper seat end down. The ow arrow should be pointing up. 3.2 Clean the end connections and mating pipe priorto valve installation. It is recommended that the valve be supported properly to prevent strain andfatigue of the end connections.Figure 1

11、III Maintenance 4. MaintenanceM&J swing check valves require minimal maintenance.Under normal operating conditions, no periodic maintenance is necessary. Recommended spare parts available through M&J Valve Company consist of clapper and cover seals, clapper, shaft, retainer pin, and arm. For

12、 valves having removable seats, seat rings and seat seals are also recommended.When ordering spare parts, specify the valve serial number, valve size, ANSI pressure class, and type of service.Inspection and RepairCaution: Body pressure MUST be relievedbefore any attempt is made to serviceinternal pa

13、rts of the swing checkvalve. Follow all safety proceduresand appropriate regulations forhandling the pipeline media.4.1 Remove the valve cover plate. Remove andinspect cover seal replacing if damaged orshowing excessive set. NOTE: M&J Valverecommends that the cover seal be replacedeach time the

14、cover is removed.4.2 Clapper removal.4” and smaller4.2.1 Lift clapper assembly out of valve hangersection.4.2.2 Inspect clapper seal for damage. Replace ifrequired. Inspect clapper for any imbeddedforeign material. Remove as required.NOTE: Severely damaged clappers mayrequire replacement.4.2.3 Clean

15、 and inspect clapper bushings.6” and larger4.2.1 Remove shaft-retaining plug. Larger valvesizes may have a bolted on cap.4.2.2 Support clapper assembly and inspect armhanger section of body noting bushingorientation between arm and body.4.2.3 Remove shaft. A 3/8”-16UNC tapped holeis provided in the

16、shaft end to aid in shaftremoval. To remove the shaft, screw a capscrew or eyebolt into the tapped hole andpull on the screw. Clean and inspect shaftfor damage before re-installing into valve.Replace shaft if required.4.2.4 Remove clapper/arm assembly and inspectseal for damage. Replace if required.

17、Inspect clapper for any imbedded foreignmaterial. Remove as required. NOTE:Severely damaged clappers may requirereplacement.4.2.4.1 To replace clapper, remove retainer pinand nut then pull clapper from arm. Installnew clapper onto arm shaft and replaceretainer nut and pin.NOTE: Clapper retainer pin

18、must be replaced to insure safe operation.4.2.5 With clapper and shaft removed, inspectbody seat face and arm hanger section ofbody for wear.4.2.6 Reassemble valve in reverse order, insuringthat shaft washers are replaced in originalorder.WeightsValve ANSI WeightSize Class(lbs.1503530042260045900150

19、150703007036007590018015080300120460014090025015016030022066003609004201503003003408600600900 760Valve ANSI Weight Size Class(lbs.150630300790 1060097090011601509703001100 126001450900189015016803002210 166002520900284015021003002580 206004000900420015035303004200 24600552090084204B1 - BODY . The bo

20、dy is cast carbon steel unless otherwise speci ed. Top entry allows easy inspection and maintenance. Bosses are provided for drain taps or bypass as speci ed.B2 COVER . The cover, complete with integral lifting holes, is made from plate unless otherwise speci ed. A plugged ½”NPT port is provide

21、d.B3 SHAFT PLUG . The shaft plug covers the shaft opening. It is made from carbon steel unless otherwise speci ed.B4 COVER PLATE STUD . Used to attach cover plate to body. Material is as speci ed.B5 COVER NUT . Used to attach cover plate to body. Material is as speci ed.B6 PIPE PLUG . Used to plug o

22、ff cover port.S1 COVER SEAL . The cover seal provides the seal between the body and cover. Material is as speci ed.S2 CLAPPER SEAL . The clapper seal provides the seal between the body and clapper. Material is as speci ed.S3 SEAT SEAL (Optional. Used when removable seat is required. Material is as s

23、peci ed.IV Parts ListT1 ARM . The arm is cast carbon steel unless otherwisespeci ed. It holds and guides the clapper.T2 SHAFT . The shaft is made from 300 series stainless steel unless otherwise speci ed. It supports the arm.T3 CLAPPER . The clapper is cast carbon steel unless otherwise speci ed. It

24、 holds the clapper seal. The armattaches to the back of the clapper using an integral threaded stud with a nut and retainer pin.T4 CLAPPER RETAINER NUT . The clapper retainer nut holds the clapper on the arm.T5 CLAPPER RETAINER PIN . This pin keeps the clapper retainer nut from inadvertently coming loose. It is made from 300 series stainless steel unless otherwise speci ed.T6 BUSHING . The bushing isolates the arm from the body allowing free movement.T7 REMOVABLE SEAT (Optional. Allows seat to bereplaced if seal area becomes