ANSON Inline Check Valve [PDF]

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In Line Check Valve SERVICE & SPARES INFORMATION

1. 5. 9. 13. 17.

Seat Insert ‘O’ring Flapper Housing Detachable Nut Retaining Pin

2. 6. 10. 14. 18.

Body/Female Union Flapper Lip Seal Locking Key Socket Head Screw

3. 7. 11. 15. 19.

Body/ Male Union Torsion Spring (2” only) Circlip Socket Head Cap Screw ‘O’ring

4. 8. 12. 16.

‘O’ring Hinge Pin Segment ‘O’ring

Parts Location

1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19.

Seat Insert Body/ Female Union Body/ Male Union ‘O’ring ‘O’ring Flapper Torsion Spring (2” Only) Hinge Pin Flapper Housing Lip Seal Circlip Segment Detachable Nut Locking Key Socket Head Cap Screw ‘O’ring Retaining Pin Socket Set Screw ‘O’ring

NOTE Valve illustrated has flow Male to Female Union end. Valves are supplied with alternative flow directions and with other end connections.

Shoulder 7 9

6

17

Fig 1

Dismantling

1. Remove socket head cap screw (15) by turning anticlockwise. Release key (14). 2. Fix female body (2) in a vice and unscrew the male body (3) anticlockwise using a toggle bar or suitable wrench. Remove ‘O’ring (19) from the male body. 3. Remove seat insert (1), flapper (6) and housing assembly (9) by applying light pressure with a drift in the opposite direction to the flow. 4. Remove ‘O’rings (4),(5) from seat insert (1) and lip seal (10) from body (2). 5. Use a drift to tap the hinge pin (8) out of the housing (9) thus releasing flapper (6) and spring (7) (if fitted). 6. Remove screw (18) to release pin (17) and ‘O’ring (16) only if damage is evident to the pin. 7. Union nut (13) can be released by removing circlip (11) then removing segment (12).

Inspection 1. Visually inspect all metal parts for wear, corrosion and damage. The flapper face should be flat and seal against ‘O’ring (5) in the seat insert (1). If the body cavity in (2) has been eroded, Anson can supply safe wall thickness limits. Discard any suspect parts. 2. Replace all seals using recommended spares kit (see back page). 3. Check tension on torsion spring (7) and replace if necessary.

Assembly 1. Clean all components thoroughly and ensure all foreign matter is removed. 2. Insert pin (17) and ‘O’ring (16) into the body (2). Coat screw (18) with anti-seize compound and screw into the body. 3. Assemble flapper (6) in housing (9) using pin (8). On 2” valves ensure the spring (7) is aligned with one leg down the rear face of the flapper. This assembly is normally supplied complete (see spars kits, back page). 4. Ensure that when assembly is placed on the seat insert (1) the flapper (6) makes contact all round its circumference. 5. Place assembly in the female body (2) so that the slot in the bottom of the housing (9) engages with pin (17) fixed in the body, and the flapper (6) is free to move in the direction of the fluid flow. Upper torsion spring leg must locate behind the shoulder holding flapper housing in place (See Fig 1) 6. Lightly smear seal (4), (5) with assembly lubricant and fit to the seat insert (1). Fit insert into body (2) against shoulder provided. 7. Lightly smear ‘O’ring (19) with lubricant and fit to male body (3). Coat threads on male and female body with anti-seize compound. Screw male into female until keyway is aligned. 8. Fit key (14) and secure with screw (15), apply anti-seize compound to the screw prior to assembly. 9. Fit nut (13) to male end using segments (12) and circlip (11). 10. Fit union seal (10) to female union end.

Caution The valve is now ready for testing however any test blinds fitted to the assembly should have provision to bleed off any entrapped pressure that can remain in the body cavity after test.

Maintenance Intervals ANSON cannot recommend specific maintenance intervals due to the wide range of pressures, temperatures and fluids handled by these valves. The responsibility for setting maintenance intervals must lie with the end user. However, we would make the following minimum recommendations :• Whenever the valve has been stripped down take the opportunity to replace the seals with new ones. • Always flush the valves through with clean water when acids or cements have been passed through them. • Above all do not wait for the valve to leak before undertaking routine maintenance. Regular inspection of internal parts will extend the useful life of the valve.

Spares

2” Valve Mk 1* Std. Sour Gas Service

Contents of Spares Kit

Kit Numbers 3” Valve Mk 1* 2” Valve Mk 2* Std. Sour Gas Std. Sour Gas Service Service

3” Valve Mk 2* Std. Sour Gas Service

Flapper Valve Assembly (6) (7) (8) and (9)

1C2

1C2SG

1C3

1C3SG

1C2-2

1C2SG-2

1C3-2

1C3SG-2

Seat Insert (1)

2C2

2C2SG

2C3

2C3SG

2C2-2

2C2SG-2

2C3-2

2C3SG-2

Complete Set of Seals (4) (5) (10) and (19)

3C2

3C2SG

3C3

3C3SG

3C2-2

3C2SG-2

3C3-2

3C3SG-2

Complete Set of Spares (1) (4) (5) (6) (7) (8) (9) (10) (14) (15) and (19)

4C2

4C2SG

4C3

4C3SG

4C2-2

4C2SG-2

4C3-2

4C3SG-2

* Check valves with assembly dates after January 89 will be Mk 2 valves. If in doubt consult the factory.

ASSEMBLY LUBRICANT

:

ANSON Part No. 20441

THREAD PROTECTION

:

ANSON Part No. 15471 (Copper based anti-seize compound). Supplied in single tins of 1/2 kg (1.1 lb.).

Flowline equipment and Valves for the oil and petrochemical industries. ANSON FLOWLINE EQUIPMENT Inc. Texas. USA Tel: (713) 466 9470 Fax USA (713) 466 7482 ANSON ABERDEEN Sales and Service Tel. (01224) 771877 Fax. (01224) 771848 ANSON DUBAI Sales Tel. +9714 838659 / 836204 Fax. +9741 838663 ANSON Ltd, Queensway North, Team Valley Trading Estate, Gateshead, Tyne and Wear NE11 ONY England.

Tel: (0191) 4820022 Telex: 537936 Fax: (0191) 4878835 E mail [email protected] M02 issue 3