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| ? | We have a 24" 150# Lug Butterfly Valve 316SS Flowseal #1LA222RTG30G. Could you please tell me if this is rated a class 6 shutoff and if not do you have anything to quote that would carry this rating. |
| A | Your valve has a RTFE seat. All Flowseal Valves with a soft seat (TFE, RTFE, UHMWPE) are tested as a minimum to MSS SP-68 with an allowable leakage of zero. Consequently our valves exceed ANSI/FCI 70-2 Class 6 requirements. |
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Alloy-20 top
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| ? | From your site we see that you are supplying alloy-20 products. Kindly let us know the ASTM equivalents of alloy 20 for castings, forgings, plates & pipes and also kindly let us know the physical properties & chemical compostion of alloy 20. |
| A | Crane offers gate, globe, and check valves manufactured out of Alloy 20 from both Pacific Valves and Aloyco. Aloyco valves are cast from ASTM A351 grade CN7M (casting UNS is J95150). Pacific Valves are forged to ASTM B462 Alloy 20 CB3. Bar stock Alloy 20 is ASTM B473 N08020, Plate is ASTM B463 N08020, and Tubular is ASTM B463 and B468 N08020. The chemical Properties are: Element, % (maximum, except where range is given) Carbon 0.07 Manganese 1.50 Silicon1.50 Sulphur 0.040 Phorsphorus 0.040 Chromium 19.0-22.0 Nickel 27.5-30.5 Molybdenum 2.0-3.0 Copper 3.0-4.0
The physical properties are: Tensile Strength, minimum, ksi 62 Tensile Strength, minimum, Mpa 425 Yield Strength, minimum, ksi 25 Yield Strength, minimum, Mpa 170 Elongation in 2 inches, or 50 mm (min%) 35.0 |
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Boiler Non-Return Valves top
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| ? | Our steam heating plant utilizes four low pressure steam boilers which operate at 10psig. Will the Figure 30E valves work reliably at such low pressures? Can the lack of a stop check cause water level problems and the loading of steam headers with greater than normal amounts of condensate? We typically run two boilers at a time through the winter. Sometimes our operators do not close the steam stops when idling or after switching boilers. Thanks for any help you can give me. |
| A | The Crane Cat, 28E and 30E Stop-Check Valves are for installation between boilers supplying the same steam header, and positioned with pressure under the disc. The Straightway pattern is for horizontal lines or vertical lines with upward flow. Angle-pattern valves are for "horizontal-downward" or "upward-horizontal" flow.
These valves will perform the four following important functions:
1) Act as an automatic-non-return valve applied as a containment device to prevent gross backflow of steam from main header to boiler in case the boiler fails.
2) Assist in cutting out the boiler, when ceasing to fire. In this case, the valve disc automatically closes to restrict backflow of steam to the boiler.
3) Assist in returning the boiler after a shutdown.
4) Restricts the backflow of steam from the header into the boiler which has been shut down and accidentally opened. The check valve feature should not be relied upon for primary shut-off.
The amount of pressure to lift the disc off the body seat is an approximate number that was determined by calculations. It is assumed that the valve will be operating in ideal conditions, i.e. valve interior and working parts are clean with little to no wear and the valve is installed with the stem in the proper upright position. The approximate pressure to lift the disc off the body seat is 0.7 psig to 1.5 psig depending upon the valve size. This pressure will only move the disc off of the body seat and not maintain the disc in the full open position. Since Stop-Check valves have a floating member, it is important the valve be sized to provide full disc lift under flow conditions prevailing during the major portion of the service life. It is recommended that the flow through the valve have sufficient velocity (fps) to provide full disc lift. The formula to determine the velocity (fps) for full disc lift is: v (fps) = 60*B^*V where: v = velocity (fps) B^ = ratio of the squares of pipe dia. to seat dia. (d1/d2) where d1 is square of small dia. and d2 is square of large dia, V = square root of the specific volume (cubic feet per pound) of fluid.
The Crane Stop-Check valves are equipped with (2) ½" NPT drains for draining condensate. When a steam line is shut down and cools off condensate can accumulate.
To size the valve(s) the following is needed: 1) Pressure (psig) 2) Temperature (°F) 3) Flow of steam in pounds per hour.
I would recommend you contact the appropriate regulating authority as to their requirements for heating boilers. |
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Brass Fig. No.s top
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| ? | We specify figure numbers but some appear to have changed. Can you identify brass figures numbers for: Gate soldered 13420 Globe soldered 1310 Check threaded 34 Check soldered 1303 |
| A | Gate soldered 13420 Model number should be 1342-300CWP, solder end joint, swing check valve, Sizes 1/2" through 3". Globe soldered 1310 300CWP, solder end joint, Globe Valve, Sizes 3/8" through 2". Check threaded 34 Class 125. Threaded, swing check valve. This figure number is no longer available. Crane 37 Y-pattern or Crane 1707 swing pattern is recommended. Check soldered 1303 200CWP, solder end joint, Swing check valve, this figure is no longer available. Crane Fig. No. 1707S is recommended. |
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Check Valve top
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| ? | What is a check valve? |
| A | A check valve in its simpliest definition is a non-return valve that prevents back-flow in a pipeline. |
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CV Factors top
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| ? | What are the Cv factors for Gate, Globe and Check Valves up to 24", Class 300 and below? |
| A | | Cv Factors for Class 300 and Below | | Gates | | Size | ID Sch 40 Pipe | Resistance factor | K factor | Cv factor | | 2 | 2.067 | 0.019 | 0.15 | 327.67 | | 2 1/2 | 2.469 | 0.018 | 0.14 | 480.32 | | 3 | 3.068 | 0.018 | 0.14 | 741.65 | | 4 | 4.026 | 0.017 | 0.14 | 1,314.16 | | 5 | 5.047 | 0.015 | 0.12 | 2,198.60 | | 6 | 6.065 | 0.015 | 0.12 | 3,174.99 | | 8 | 7.981 | 0.014 | 0.11 | 5,690.85 | | 10 | 10.020 | 0.014 | 0.11 | 8,970.11 | | 12 | 11.938 | 0.013 | 0.10 | 13,213.49 | | 14 | 13.124 | 0.013 | 0.10 | 15,969.34 | | 16 | 15.000 | 0.013 | 0.10 | 20,861.09 | | 18 | 16.876 | 0.012 | 0.10 | 27,483.66 | | 20 | 18.812 | 0.012 | 0.10 | 34,151.16 | | 24 | 22.624 | 0.012 | 0.10 | 49,394.02 | | K1 factor for Gates: 8 | | Globes | | Size | ID Sch 40 Pipe | Resistance factor | K factor | Cv factor | | 2 | 2.067 | 0.019 | 6.46 | 50.26 | | 2 1/2 | 2.469 | 0.018 | 6.12 | 73.68 | | 3 | 3.068 | 0.018 | 6.12 | 113.76 | | 4 | 4.026 | 0.017 | 5.78 | 201.58 | | 5 | 5.047 | 0.015 | 5.10 | 337.25 | | 6 | 6.065 | 0.015 | 5.10 | 487.02 | | 8 | 7.981 | 0.014 | 4.76 | 872.94 | | 10 | 10.020 | 0.014 | 4.76 | 1,375.95 | | 12 | 11.938 | 0.013 | 4.42 | 2,026.86 | | K1 factor for Globes: 340 | | Checks | | Size | ID Sch 40 Pipe | Resistance factor | K factor | Cv factor | | 2 | 2.067 | 0.019 | 0.95 | 131.07 | | 2 1/2 | 2.469 | 0.018 | 0.90 | 192.13 | | 3 | 3.068 | 0.018 | 0.90 | 296.66 | | 4 | 4.026 | 0.017 | 0.85 | 525.67 | | 5 | 5.047 | 0.015 | 0.75 | 879.44 | | 6 | 6.065 | 0.015 | 0.75 | 1,270.00 | | 8 | 7.981 | 0.014 | 0.70 | 2,276.34 | | 10 | 10.020 | 0.014 | 0.70 | 3,588.04 | | 12 | 11.938 | 0.013 | 0.65 | 5,285.40 | | 14 | 13.124 | 0.013 | 0.65 | 6,387.74 | | 16 | 15.000 | 0.013 | 0.65 | 8,344.44 | | 18 | 16.876 | 0.012 | 0.60 | 10,993.46 | | 20 | 18.812 | 0.012 | 0.60 | 13,660.47 | | 24 | 22.624 | 0.012 | 0.60 | 19,757.61 | | K1 factor for Swing Checks: 50 | |
| | Doug Clendenin |
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Electric Actuator top
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| ? | Of our line working pressures average from 60 psi to 100 psi what size (torque) electric actuator would you suggest for our system? Our lines are maintained at 275 to 300 degrees year around. 150# 8 inch soft seat Flowseat butterfly. |
| A | Based on 100 psi differential pressure use a torque value of 1800 Lbs. Ins. |
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Gear Operator top
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| ? | We have WG5616 type gear operator for 24" flowseal butterfly valve. This gear operator is continuously giving us problems. Every time worm gear and gear segment teeth are getting damaged. It seems there is some obstruction. Please advise. |
| A | The Flowseal High Performance Valves are position seated rather than torque seated. The fact that you are breaking gears indicates that excessive force is applied in attempt to close the valve. If, in fact, you are having difficulty in obtaining closure then we must find the reason. Usually the reason is that A) something is caught between the valve body and the disc preventating closure, B) line debris has damaged the seat or disc edge, or C) the stops on the gears are out of adjustment.Setting the stops on the gear operators is easily accomplished. Instructions can be found on our website in the Floweal catalogs (fsim.pdf). If setting the stops does not help then further exploration is required. The valve must be removed from the line and examined. |
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Globe Valve top
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| ? | We have a problem with a 4" globe valve, 900#, API 600 for amine service. The valve is difficult to open with high differential pressure. Should we replace the handwheel with a gear operator? |
| A | We suggest you turn the valve end for end and try having the flow come up from under the disc. This way you you will be closing against the pressure instead of opening. Then if the valve is too hard to close and seal off, you may indeed need a gear operator to develop enough torque to effect a seal. We must caution you though that our recommendations are based on general valve application experience that we have, not a recommendation for your specific application. You should always consult with a process piping consulting engineer prior to making any changes to your process piping. |
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Grease for HF Acid Valves top
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| ? | What type of grease can be used on HF Acid Valves for the Grease Injectors? |
| A | The grease is used by Pacific is: Desco 410 Polymel regular model # 410J-01 Mfr: Chemola, Houston, TX |
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HF Acid Valve top
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| ? | Does the HF Acid Pacific Gate valve compare in price and performance to that of Plug valves built to the same specifications? |
| A | In almost all applications the Pacific HF Acid Valve is less expensive than a comparable plug valve. Our valves are available in multiple configurations such as metal to metal seat, PTFE trim and our High Integrity Shutoff valve which is a combination of both. |
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Hydrodynamic Torque top
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| ? | I need help calculating the hydrodynamic torque for a 24" HPBFV at 70 degrees disk angle. Using the available chart in the catalog, this valve would have a dynamic torque of 600,000"# with a delta P of 150 at 70 degrees. This seem quite high! |
| A | It seems that you have come up with the 600,000# ins based on a closed Delta P of 150PSI. The difficulty in using the Hydrodynamic chart is that you must know the true Delta P at the angle you are looking at. Remember that if you have 150 PSI closed DP, as soon as you open the valve you now have something less than 150. At 70 degrees your DP could conceivably be that caused by the valve. Actual measurements of a full system analysis such as that provided by the Crane Flow of Fluids program are required to get the true DP. |
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Jenkins J1042B2 top
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| ? | What is the total stem travel of a 12" 300# FRF, Jenkins J1042B2? |
| A | Total stem travel for this valve is 60 mm (2.36"). |
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Maintenance top
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| ? | What do you recommend for general maintenance on 465 1/2 gate valves as far as operating valve once or twice a year, packing adjustment, etc? Also, what do you recommend for installation position (vertical/horizontal)for valves 8" and larger? |
| A | MSS SP-92, MSS Valve User Guide, published by the Valve Manufacturers Standardization Society, states in Paragraph 6.8.2:
"Valves which remain in position for long periods of time may be hard to operate and/or not function as well as when originally installed. This reduction or operability can result from either a loss of effective lubricants in the stem threads, aging of packing, surface corrosion of moving parts, or an accumulation of deleterious solids. In some applications it may be desirable to schedule periodic partial or full cycle exercising of such valves."
Due to the variety of applications and environments in which the Crane 465 1/ 2 gate valve may be installed, we do not publish a recommended frequency of operation. A general rule of thumb is that valves should be exercised at least once a year, but in harsh conditions more frequent exercising may be requried.
With regards to installation orientation, all Crane gate valves are designed to be installed with the stem either vertical (preferred) or horizontal. A valve is less likely to be subject to later problems with stem vertical, although full functionality is maintained with the stem horizontal. |
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National US top
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| ? | Did your company make the National US oil hot water furnace? If so we need installation requirements for model 70-122. We want to move this furnace to the garage and need the requirements in order to get a building permit. The furnace has been operating for 27 years and repair people say it is in better shape than the ones on the market now. |
| A | Crane Co. acquired the company that manufactured National-US boilers many years ago and continued the production ot that equipment for some time. Unfortunately the division of our company that manufactured not only the boilers but also the forced air heating and air conditioning equipment sold by Crane was shut down in the 1970's. We have always worked in the Valve and Fitting or Valve Division of Crane Co. and as such we do not have the information you need. Nor do we have any idea where we might refer you for products discontinued so many years ago. We would genuinely like to be of more help to you but frankly this may be an area where we cannot provide the information you seek. |
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Post Weld Heat Treatment top
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| ? | We are trying to find out if there is any special requirements required when we weld and stress relieve butt weld globe and gate valves onto the piping systems. Do we need to remove the internals of Butt Weld valves before these valves are welded onto the pipes? Is it acceptable to open the valve before it is welded and stressed relieved in lieu of removing the internals?
Thanks
Phil Hopstein Siemens Westinghouse |
| A | Typically we do not recommend the removal of the internals for PWHT or Welding. Gate valves should be opened approximately 10% to allow for thermal expansion. Globes can be opened slightly as well. Great care should be taken to ensure that no debris is trapped between the seating surfaces of the valve. More detailed information regarding this subject is available in our maintenance manual sections"A,B,C,D & O", which are available on our website, www.cranvalve.com |
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| ? | Can you perform Post Weld Heat Treatment on Pacific Fig#3656G-HF8T valves? (temperature will reach 1150F) If so, what are the risks to the internal parts? Can the Teflon seats be replaced? |
| A | Typically we recommend using welding procedures that do not require PWHT for this type of valve such as a P1 to P1 welding procedure. The concern is more for the Teflon in the seats vs. the packing. Larger valves are less susceptible to this, due to the greater mass but may still experience problems. Unfortunately due to the size restrictions the seat cans only be inserted using special equipment here at the factory. This equipment is used through the flow bore to mount the seat rings. So unless the valve is removed from the line and returned to the factory, which is not economically feasible, the Teflon seats are not replaceable. Therefore we do not recommend PWHT on this style due to the risk of damaging the seats. |
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Series 200 BFV top
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| ? | Looking for 6" Series 200 Butterfly valve capable of being mounted in floor of transformer oil catch basin. Valve will be submersed in water until being drained each month. Also would prefer operating shaft to be adjustable in angle (not just 0 or 90 degrees). |
| A | Assuming that you are mounting to an ANSI 150# flange, you may use any 200 series valve for this application. (A flat steel plate will also work provided that the bolt and bolt circle dimensions are the same as an ANSI 150# flange). The other area of concern is the selection of materials. The body and disc must withstand the corrosiveness of the water and the seat must be able to handle the residual oil. We have both iron and 316 SS bodies, the disc is offered in iron, aluminum bronze and 316 SS. For the seat selection, we would need to know more about the oil. For the handle, we offer a 10 position lever-lock handle which will allow you to position the handle in 9 degree increments as well as full open and full closed. |
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Standard Wedge Type top
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| ? | Which is the standard wedge type supplied for a gate valve, solid or flexible? |
| A | The flexible wedge is standard for most Crane and Jenkins Cast Steel gate valves. In truth, there is not much flex in discs below 3" Class 150. However, as the pressures go up, and the sizes go up, the flex actually performs a necessary function. In stainless Steel valves, where trim is integral to the valve body, galling can happen as temperature goes up. We use a solid wedge in Class 150 up to 2-1/2". Our standard product offering will soon be flexible wedge 3" and larger. In class 300 and 600 the flexible wedge will be used 2" and larger. Prior to this change we offered a split wedge, where the disc was actually two separate pieces. |
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Swing Check top
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| ? | Can a standard swing check valve (our application is 3") be placed in the vertical position or is the horizontal position preferable? |
| A | Standard swing check valves in the vertical position are acceptable. The flow must be going up and the valve should be as far as possible (minimum of 30: for a 3" valve) from anything that could cause turbulence, such as an elbow or a pump. If the pipe is not truly vertical, you may want to consider adding an outside lever and spring or an outside lever and weight assembly. |
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Trim Designations for Pacific Valves top
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| ? | What do Pacific Valves' trim designations mean? |
| A | Pacific's trim designations are as follows:
U =13% chrome stem with Half Stellite or equal (seat rings are stellited)
1 = 13% Chrome trim
2 = 13% chrome stem with Full Stellite only
5H = Not Available
7 = 13% chrome stem with Full Stellite or equal
8H = Monel Stem and disc facing with Stellite or equal seat rings
9H = Hastelloy "B" stem and disc facing with stellite or equal seat rings
10H = 304ss Stem with Full Stellite or equal
12H = 316ss Stem with Full Stellite or equal
14H = Alloy 20 stem and disc facing with stellite or equal seat rings
15 = Special trim defined in order
\17H = 347 ss stem and disc facing with stellite or equal seat rings
27H =Hastelloy "C" stem and disc facing with stellite or equal seat rings |
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Types of Valves top
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| ? | What is the difference between the various types of valves you offer? |
| A | Gate Valves are only for on-off service. They should be operated fully opened or fully closed, never in a partially closed position. They have very low pressure drop and are used regularly for isolating equipment that may have to be maintained in the future.
Globe Valves are for used throttling. They are designed to operate in a partially-opened position. Several disc designs exist and care should be taken in evaluation the correct design for your application. This should be decided based on the flow conditions of the system. Globe valves are not pressure-reducing valves, they strictly limit the amount of media that can flow through the valve.
Check valves are used to prevent reverse flow. They are most often used to protect rotating equipment such as pumps or turbines from the effects of flow reversal. There are many designs such as lift check, swing check, double disc check, piston check, nozzle check, etc.
Ball Valves are similar to gate valves in that most manufacturer's only recommend them for full open or full closed operation. Some smaller ball valves are used in balancing applications where they are set in a partially opened position and left for a long period of time. This is not recommended because the flow wears the seat which is exposed in this partially open position. Eventually the valves will not close because of this seat wear. This is the valve of choice when seating material limitations are within the system's normal operating conditions because of the ease of the quarter turn operation. Floating ball and trunion mounting of the ball are different design choices that need to be made based on system conditions.
Butterfly valves are used for both on-off service like a gate valve and for throttling and modulating flow like a globe valve. The quarter turnoperation makes them easy to operate and to mount remote control equipment for process control. Again the seating materials limit butterfly valve capabilities, but technological advancements in elastomeric materials as well as metal-seating technology have greatly improved in recent years so that butterfly valves have wide application in various industries and usually are used in piping systems of 2" and larger diameter.
Plug valves are very similar to ball valves and come in many varieties and configurations. |
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Valve storage top
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| ? | We are trying to find out the storage requirements for Crane and Pacific Valves that have motor operaters installed on them. Can these valves be stored outside or should they be installed inside in a warehouse prior to installation? In cases where there is not any heaters installed on the valves, where and how should these valves with operators be stored.
Thanks
Phil Hopstein |
| A | The preferred method is to store the valve indoors.Moisture and debris are primary causes of valve and motor problems. Section "N" of our maintenance manual, available on our website www.cranevalve.com, covers this in better detail. You may also want the specific storage recommendations of the motor operator manufacturer. |
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Welding valves in line top
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| ? | We currently have a model # 2155-7-C5-WE-BG 14" bolted bonnet Pacific gate valve. If we were to do welding for a modification to the pipe line inwhich this valve is in, what position should the valve be in to do this welding. This welding will also require post weld heat treatment. Please provide as soon as possible. Thanks |
| A | The valve should be opened slightly, approximately 10%. This will allow for any thermal expansion of the valve body that may occur and ensure that the wedge does not become stuck. The valve should remain in the sam position during the PWHT. |
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Wrenches top
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| ? | Do you have any valve wrenches for handwheels? These are handtools that the operator would use for large valves. |
| A | We do not offer the type of tool that you seek. That tool, as we picture it, is a lever with two or more right angle elements that is used to apply additional force to the spokes of a valve handwheel through the principle of leverage. This type of tool is commonly called a "cheater bar" in the industry and is NOT recommended for use with any Crane valves. If additional force is required to open or close a valve and if the valve is being used correctly we recommend that consideration be given to the use of either a manual gear operator or powered actuator. |
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Y2K top
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| ? | What is the status on Crane Nuclear's Y2K program? |
| A | Nuclear went live on Y2K compliant business system on Monday 11/7/99. All is going well. |
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