Hattersley C31 Installation And Operating Instructions Manual

Page 1
Installation and Operating Instructions
www.cranebsu.com
Every effort has been made to ensure that the information contained in this publication is accurate at the time of publishing. Crane Ltd assumes no responsibility or liability for typographical errors or omissions or for any misinterpretation of the information within the publication and reserves the right to change without notice.
Designed and manufactured under quality management
systems in accordance with BS EN ISO 9001:2008
FM311 ISO 9001
11-15 EPSILON TERRACE, WEST ROAD, IPSWICH, IP3 9FJ HOME SALES: +44 (0)1473 277410 EXPORT SALES: +971 4816 5800 TECHNICAL HELPLINE: 0845 604 1790 FAX: +44 (0)1473 277411 EMAIL: uksales@hattersley.com EMAIL: export@hattersley.com
www.hattersley.com
Fig. C31 Bronze Gate Valves
Gate valves provide complete shut off,
providing the seats remain undamaged, and offer very little resistance to flow in the open position. Gate valves are best suited to infrequent valve operation, as any dirt in the system can cause scuffing of the seats. Gate valves are not recommended for use in the partially open position because vibration and erosion of the disc may occur.
Service temperature and pressure
indicated on the identification plate or body marking should not be exceeded.
Hattersley gate valves have not been
designed as fire safe valves.
Valves must be installed into a well
designed system and it is recommended that the system be inspected in accordance with the appropriate member state legislation.
H_C31_0117
IOM_004B00C31D799
Page 2
Installation and Operating Instructions
Installation
Hatter sley Fig. C31 Bronze Ga te Valves Hatter sley Fig. C31 Bronze Ga te Valves1 2
Fig No. Materials
PED category by valve size
SEP Not CE Marked
C31 Bronze 1/2” - 2”
Preparation
Ensure valve is suitable for service
conditions e.g. pressure, temperature, service media.
Remove dust caps/flange protectors,
where fitted.
The installation shall be designed to
provide adequate means of draining and venting to permit cleaning, inspection and maintenance in the correct manner.
The product has not been designed to
include corrosion, erosion or abrasion allowances. Any queries regarding service applications should be addressed to the Hattersley - Technical Sales Department.
The valves have been designed for
loadings, appropriate to their intended use and other reasonably foreseeable operating conditions. Loadings caused by traffic, wind and earthquake have not been taken into account.
It is the responsibility of the installer
to ensure that the valves do not exceed the allowable limits of pressure. However the equipment is designed to withstand a momentary pressure surge of up to 10% above the maximum working pressure. The piping system shall be so designed to reduce the risk of fatigue due to vibration of pipes.
Valve Location
Valves should be located to ensure ease
and safety of operation and access allowed for subsequent maintenance of the valve.
Valves should be located to allow access
for gland adjustment and re-packing.
Piping Supports
These must be carefully aligned and at the correct distance between centres for the size and type of pipe. The following publications provide details of correct spans and installation details:
BS3974, Specification for Pipe Supports(Available from BSI)
Threaded Joints
The valves are supplied with taper threads and, with the use of a thread sealant will give a pressure tight seal. To avoid distortion of the valve when fitting and tightening pipe, the valve must be held securely using the flats provided at the end of the valve to which the pipe is being fitted. Care should be taken to avoid ʻpipe endingʻ. This is a condition that occurs when the pipe is screwed in too far resulting in distortion to the valve seat. The male thread on the pipe must have fully formed, undamaged threads.
Operation
Bronze Gate valves are designed to seat with the Hattersley standard hand wheel. Levers, wrenches or other tools should not generally be used to operate a valve. Excessive torque can cause damage to seating faces and/or stem/handwheel.
Routine Maintenance
Check for leaks at gland. If gland is leaking
tighten the gland nut(s). The gland nut(s) should be tightened only enough to prevent stuffing box leakage. Over-tightening can cause excessive wear on stem and packing and make valve difficult to operate. If leakages still occurring add additional or new packing.
Occasionally operate valves that remain
open or closed for long periods to ensure they are in good working order, thus avoiding the possibility of being inoperable in a time of emergency.
General Considerations
Maximum operating pressure reduces as
service temperature increases. Pressure and temperature limitations are shown by the valve body marking or on the identification plate, and must not be exceeded.
Valves are not designed to operate under
high shock loadings. Where pressure increases occur due to shock loading (water hammer), they should be added to the working pressure to obtain the total pressure acting on the valve. The total must not exceed the pressure rating of the valve. A pressure surge, or shock, is usually caused by the rapid closure of a check valve or quarter turn valve resulting in a sudden reduction in flow rate.
It is bad practice to install valves with the
hand wheels pointing downwards, as damage may be caused to the gland packing and stem seal, by debris in the system.
Where the handwheel, and therefore
the identification plate, is removed for maintenance they must be refitted after the work is completed.
The surfaces of valves in service may be subject to extreme temperatures; care
should be taken when handling.
The above products are not suitable for use with unstable fluids.
Loading...