Common use of Valves Clause in Contracts

Valves. Valves shall be installed to meet valve manufacture’s recommendation. For example, valve with vertical actuator shall not be installed with actuator in any other way but vertical. Nameplates on safety and relief valves shall indicate manufacturer’s name, model number, size, set pressure, capacity, orifice size, materials, and approving authority stamp symbol. Each safety and relief valve shall be supplied with a test certificate issued by the approving authorities and shall be subject to the Purchaser’s approval. All valves and valve actuators shall be accessible for operation and maintenance. Block valves shall be provided for all equipment, except the air-side of rotor air coolers. Valving and other accessories shall be positioned and physically spaced relative to other equipment so as to allow convenient access for operation and maintenance. Crowding of piping, components, and accessories shall be avoided. Valves shall be arranged for convenient operation from an appropriate floor level or platform and shall be provided with extension spindles or gearing, as required. Deviations from this design criterion require Purchaser approval before design finalization. Where extension spindles are fitted, all the thrust when opening or closing the valves shall be taken directly on the valve body and all pedestals shall be mounted directly on floor girders or other stationary members. Chain operators are not acceptable. Valves, valve handwheels, and/or valve actuators shall not infringe on Purchaser-reserved spaces or walkways. Valve pedestals shall be of approved design and be fitted with an indicator to show whether the valve is open or closed. All valves shall be arranged to close when the handwheel is rotated in a clockwise direction when looking at the handwheel from the operating position. The direction of rotation to close the valve shall be clearly marked on the face of each handwheel. All steam and water valves operating at less than atmospheric pressure shall have inverted Teflon stem packing. Hand-actuated valves shall be operable by one person. Gear operators shall be provided on manual valves when the rim pull required to open or close the valve is greater than 100 pounds. Valve materials shall be suitable for operation at the maximum working pressure and temperature of the piping to which they are connected. Steel valves shall have cast or forged steel spindles. Seats and faces shall be of low friction, wear-resistant materials. Valves in throttling service shall be selected with design characteristics and of materials that will resist erosion of the valve seats when the valves are operated partly closed. Valves with position stops that limit the travel of each valve in the open or closed position shall have the stops located on the exterior of the valve body to provide clear indication of full open and close positions. In general, the valves specified shall be standardized to use the same valve type and manufacturer to the extent possible. Except where otherwise specified or approved, gate valves greater than 3 inches in diameter in high pressure classes will be of the parallel slide type or flexible wedge type, and, when in the fully open position, the bore will not be obstructed by any part of the gate. The internal diameter of valve ends will be the same as the internal diameter of the pipe. Gate valves in pressure classes 1500 and above, standard port size, will be used whenever suitable. Gate valves in high pressure classes will have butt-welded joints except where otherwise specified or approved. Valves will not be installed in an inverted position.

Valves. Valves All the valves shall be installed to meet valve manufacture’s recommendation. For exampleof the flanged type, valve made of carbon steel with vertical actuator shall not be installed with actuator in any other way but vertical. Nameplates on safety stem and relief valves shall indicate manufacturer’s name, model number, size, set pressure, capacity, orifice size, materials, and approving authority stamp symbol. Each safety and relief valve shall be supplied with a test certificate issued by the approving authorities and shall be subject to the Purchaser’s approval. All valves and valve actuators shall be accessible for operation and maintenance. Block sealing rings of stainless steel; all valves shall be provided for all equipment, except with back seated items. Valves nominal diameter shall always be equal to the air-side of rotor air coolersrelevant pipe diameter. Valving Seals and other accessories seats shall be positioned positively fixed so that they cannot become loose in service. The fixing of seals and physically spaced relative seats by an interference fit only is not acceptable. The operating mechanism shall have means of lubrication and position indicators and, in the case of isolating valves, the means of padlocking in the open and closed positions together with approved padlocks and keys. All hand-operated valves shall close by clockwise rotation of the hand wheels which shall be marked to show the direction of closing. Valve hand wheels shall be located for safe and convenient operation with extended spindles where necessary to achieve this. All hand operated valves shall be capable of being opened and closed against their maximum working pressure fully unbalanced with a force at the hand wheel not exceeding 100 N. If necessary to achieve this, reduction gearing, ball or roller bearings shall be provided. As far as practicable, all valves for similar service shall be of the same make and type and be interchangeable. All gate valves for water and air service shall be of a type in which the operating mechanism is not subject to the working fluid. Valves other equipment so than needle type shall not be used permanently if the need for throttling is foreseen, such as to allow convenient access for operation and maintenance. Crowding of pipingadjust flow subdivision in a system, components, and accessories orifice plates or needle valves with fixed stops shall be avoidedprovided. Valves for water and oil service may be gate, butterfly, ball, plug or needle type, whichever is most suitable to the particular service and operating pressure. Valves for air service may be ball, plug or needle type whichever is most suited to the particular service. Non-return valves shall be arranged of a type specifically designed to avoid impact and water hammer on closure. The closing member shall be pivoted from the valve body, not from a lid cover. Relief valves for convenient operation from an appropriate floor level or platform pumps shall be of direct spring loaded, angle body type. For identification each valve of 150 mm. N.D. and over shall be provided with extension spindles or gearing, as requiredstainless steel identification disc on the hand wheel. Deviations from On this design criterion require Purchaser approval before design finalization. Where extension spindles are fitted, all disc the thrust when opening or closing the valves following shall be taken directly on the valve etched: • manufacturer; • catalogue number; • size inches; • rating and fluid; • trim material; • body and all pedestals bonnet material. Valves below 150 mm. N.D. shall be mounted directly on floor girders or other stationary membersidentified with size and ANSI class. Chain operators are not acceptable. Valves, valve handwheels, and/or valve actuators shall not infringe on Purchaser-reserved spaces or walkways. Valve pedestals The disc shall be of approved design and be fitted with an indicator to show whether the valve is open or closed. All valves shall be arranged to close when the handwheel is rotated written in a clockwise direction when looking at the handwheel from the operating position. The direction of rotation to close the valve shall be clearly marked on the face of each handwheel. All steam and water valves operating at less than atmospheric pressure shall have inverted Teflon stem packing. Hand-actuated valves shall be operable by one person. Gear operators shall be provided on manual valves when the rim pull required to open or close the valve is greater than 100 pounds. Valve materials shall be suitable for operation at the maximum working pressure and temperature of the piping to which they are connected. Steel valves shall have cast or forged steel spindles. Seats and faces shall be of low friction, wear-resistant materials. Valves in throttling service shall be selected with design characteristics and of materials that will resist erosion of the valve seats when the valves are operated partly closed. Valves with position stops that limit the travel of each valve in the open or closed position shall have the stops located on the exterior of the valve body to provide clear indication of full open and close positions. In general, the valves specified shall be standardized to use the same valve type and manufacturer to the extent possible. Except where otherwise specified or approved, gate valves greater than 3 inches in diameter in high pressure classes will be of the parallel slide type or flexible wedge type, and, when in the fully open position, the bore will not be obstructed by any part of the gate. The internal diameter of valve ends will be the same as the internal diameter of the pipe. Gate valves in pressure classes 1500 and above, standard port size, will be used whenever suitable. Gate valves in high pressure classes will have butt-welded joints except where otherwise specified or approved. Valves will not be installed in an inverted positionEnglish.

Valves. Valves shall be installed to meet valve manufacture’s recommendation. For example, valve with vertical actuator shall not be installed with actuator in any other way but vertical. Nameplates on safety and relief valves shall indicate manufacturer’s name, model number, size, set pressure, capacity, orifice size, materials, and approving authority stamp symbol. Each safety and relief valve shall be supplied with a test certificate issued by the approving authorities and shall be subject to the Purchaser’s approval. All valves and valve actuators shall be accessible for operation and maintenance. Block valves shall be provided for at all equipment, except the air-side of rotor air coolers. Valving and other accessories shall be positioned and physically spaced relative to other equipment so as to allow convenient access for operation and maintenance. Crowding of piping, components, and accessories shall be avoided. Valves shall be arranged for convenient operation from an appropriate floor level or platform and shall be provided with extension spindles or gearing, as required. Deviations from this design criterion require Purchaser approval before design finalization. Where extension spindles are fitted, all the thrust when opening or closing the valves shall be taken directly on the valve body and all pedestals shall be mounted directly on floor girders or other stationary members. Chain operators are not acceptable. Valves, valve handwheels, and/or valve actuators shall not infringe on Purchaser-reserved spaces or walkways. Valve pedestals shall be of approved design and be fitted with an indicator to show whether the valve is open or closed. All valves shall be arranged to close when the handwheel is rotated in a clockwise direction when looking at the handwheel from the operating position. The direction of rotation to close the valve shall be clearly marked on the face of each handwheel. All steam and water valves operating at less than atmospheric pressure shall have inverted Teflon stem packing. Hand-actuated valves shall be operable by one person. Gear operators shall be provided on manual valves when the rim pull required to open or close the valve is greater than 100 pounds. Valve materials shall be suitable for operation at the maximum working pressure and temperature of the piping to which they are connected. Steel valves shall have cast or forged steel spindles. Seats and faces shall be of low friction, wear-resistant materials. Valves in throttling service shall be selected with design characteristics and of materials that will resist erosion of the valve seats when the valves are operated partly closed. Valves with position stops that limit the travel of each valve in the open or closed position shall have the stops located on the exterior of the valve body to provide clear indication of full open and close positions. In general, the valves specified shall be standardized to use the same valve type and manufacturer to the extent possible. Except where otherwise specified or approved, gate valves greater than 3 inches in diameter in high pressure classes will be of the parallel slide type or flexible wedge type, and, when in the fully open position, the bore will not be obstructed by any part of the gate. The internal diameter of valve ends will be the same as the internal diameter of the pipe. Gate valves in pressure classes 1500 and above, standard port size, will be used whenever suitable. Gate valves in high pressure classes will have butt-welded joints except where otherwise specified or approved. Valves will not be installed in an inverted position.