| Форум -> Technical information -> Model DPV-1 Dry Pipe Valve External Resetting | Model DPV-1 Dry Pipe Valve External Resetting |
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| Engineer | Дата: 29.09.2017, в 16:07 | Сообщение №1 | 
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   | General Description
The TYCO Model DPV-1 Dry Pipe Valves are differential valves used to automatically control the flow of water into dry pipe fire protection sprinkler systems upon operation of one or more automatic sprinklers. The DPV-1 also provides for actuation of fire alarms upon system operation. |
| | | Engineer | Дата: 29.09.2017, в 16:07 | Сообщение №2 |
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| The Model DPV-1 features are as follows:
External reset.
250 psi (17,2 bar) pressure rating.
Unique offset single clapper design enabling a simple compact valve to minimize installation labor.
Ductile iron construction to ensure a lightweight valve to minimize ship- ping cost.
A variet y of inlet and outlet connections.
Compact, Pre-Trimmed, and Semi- Assembled, easy to operate valve trim.
Simple reset procedure through the elimination of priming water.
Dry pipe sprinkler systems are used in unheated warehouses, parking garages, store windows, at tic spaces, loading docks, and other areas exposed to freezing temperatures, where water filled pipe cannot be utilized. When set for service, the dry pipe sprinkler system is pressurized with air (or nitrogen). The loss of pressure through an operated automatic sprinkler in response to heat from a fire permits the DPV-1 Dry Pipe Valve to open and allow a flow of water into the sprinkler system piping. Table B establishes the minimum required system air pressure that includes a safety factor to help prevent false operations that might occur due to water supply fluctuations.
The Model DPV-1 Dry Pipe Valves described herein must be installed and maintained in compliance with this document, as well as with the applicable standards of the National Fire Protection Association, in addition to the standards of any other authorities having jurisdiction. Failure to do so may impair the performance of these devices.
The owner is responsible for maintaining their fire protection system and devices in proper operating condition. Contact the installing contractor or product manufacturer with any questions. |
| | | Engineer | Дата: 29.09.2017, в 16:08 | Сообщение №3 |
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| Technical Data
Approvals
UL and C-UL Listed FM Approved
NYC Approved
Dry Pipe Valve
The TYCO Model DPV-1 Dry Pipe Valves shall be installed in the vertical orientation only (supply at bottom flowing upward) and are rated for use at a maximum service pressure of 250 psi (17,2 bar). Valve and trim dimensions are shown in Figure 6.
Flanged connections are available and drilled per ANSI, ISO, AS, and JIS specifications (Ref. Table A). The grooved outlet connections, as applicable, are cut in accordance with standard groove specifications for steel pipe. They are suitable for use with grooved end pipe couplings that are listed or approved for fire protection system service. Available combinations of inlet and outlet connections are described in the having flanges drilled to ANSI, AS, or JIS specifications are NPT threaded per ANSI Standard B1.20.1. Trim port connections of valves having flanges drilled to ISO are available either threaded per ISO 7-1 or NPT threaded per ANSI Standard B1.20.1. Valves with NPT threaded ports will readily accept the trim arrangements shown in Parts 2 and 3 of Figures 3, 4, and 5.
Model DPV-1 Valve assemblies are shown in Figure 1. The Body and Hand- hole Cover are ductile iron. The Hand- hole Cover Gasket is neoprene, and the Clapper Facing is EPDM. The Air/ Water Seat Ring is brass, the Clapper is bronze or aluminum bronze, and both the Clapper Retaining Plate and Latch are bronze. The Hinge Pin is aluminum bronze, and the fasteners for the Hand- hole Cover are carbon steel.
Valve Trim
Installation dimensions are provided in Figure 6, and Valve Trim and Pre- Trimmed Valve Assemblies are shown in Figures 3, 4, and 5.
The valve trim, ordered separately or as a pre-trimmed valve assembly, forms a part of the laboratory listings and approvals of the DPV-1 Valve and is necessary for the proper operation of the DPV-1 Valve. |
| | | Engineer | Дата: 29.09.2017, в 16:08 | Сообщение №4 |
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| Trim packages or pre-trimmed valve assemblies include the following equipment:
Water Supply Pressure Gauge
System Air Pressure Gauge
Air Supply Connections
Main Drain Valve
Low Body Drain Valve
Alarm Test Valve
Automatic Drain Valve
Drip Funnel
Connections For Optional Quick Opening Device (Accelerator)
Pre-trimmed valve assemblies also include the following equipment:
Model BFV-300 butterfly valve
Figure 577 grooved coupling
PS10-2 waterflow alarm switch
PS40-2 low air pressure alarm switch
Order the above equipment separately when ordering trim packages separately.
Note: When the system pressure is greater than 175 psi (12,1 bar), provision shall be made to replace the standard order 300 psi (20,7 bar) Water Pressure gauge with a separately ordered 600 psi (41,4 bar) Water Pressure Gauge. |
| | | Engineer | Дата: 29.09.2017, в 16:09 | Сообщение №5 |
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| Weights
The following are the nominal weights for Pre-Trimmed Valve Assemblies, Semi-Assembled Trim, and DPV-1 Valves without trim.
Air Supply
Table B shows the system air pres- sure requirements as a function of the water supply pressure.
The air (or nitro- gen) pressure in the sprinkler system is recommended to be automatically maintained by using one of the following pressure maintenance devices, as appropriate:
Model AMD-1 Air Maintenance Device (pressure reducing type)
Model AMD-2 Air Maintenance Device (compressor control type)
Model AMD-3 Nitrogen Maintenance Device (high pressure reducing type) |
| | | Engineer | Дата: 29.09.2017, в 16:09 | Сообщение №6 |
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| | The Pressure Relief Valve provided with the valve trim is factory set to relieve at a pressure of approximately 45 psi (3,1 bar). If the normal system air pres- sure is less than or exceeds 40 psi (2,8 bar), then the pressure Relief Valve must be reset to relieve at a pressure that is in accordance with the authority having jurisdiction. |
| | | Engineer | Дата: 29.09.2017, в 16:11 | Сообщение №7 |
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| Quick Opening Device
The Model DPV-1 Dry Pipe Valve may optionally be equipped with an electronic or mechanical dry pipe valve accelerator. |
| | | Engineer | Дата: 29.09.2017, в 16:12 | Сообщение №8 |
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| | The VIZOR or the ACC-1 is used to reduce the time to valve actuation following the operation of one or more automatic sprinklers. In some cases the use of a quick opening device such as the VIZOR or the ACC-1 may be required to meet the requirements of the National Fire Protection Association to meet water delivery times. |
| | | Engineer | Дата: 29.09.2017, в 16:12 | Сообщение №9 |
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| Operation
The TYCO Model DPV-1 Dry Pipe Valve is a differential type valve that utilizes
Table B establishes the minimum required system air pressure that includes a safety factor to help prevent false operations that occur due to water supply fluctuations.
The Intermediate Chamber of the DPV-1 is formed by the area between the Air Seat and Water Seat as shown in Figure 2B. The Intermediate Chamber normally remains at atmospheric pres- sure through the Alarm Port connection and the valve trim to the normally open Automatic Drain Valve (Fig. 3, 4, or 5). Having the Intermediate Chamber, Figure 2B, open to atmosphere is critical to the DPV-1 Valve remaining set, otherwise the full resulting pressure of the system air pressure on top of the Clapper Assembly cannot be realized.
For example, and assuming a water supply pressure of 100 psi (6,9 bar), if the system air pressure is 25 psi (1,7 bar) and there was 15 psi (1,0 bar) pressure trapped in the Intermediate Chamber, the resulting pressure across the top of the Clapper would only be 10 psi (0,7 bar). This pressure would be insufficient to hold the Clapper Assembly closed against a water supply pres- sure of 100 psi (6,9 bar). It is for this reason that the plunger of the Automatic Drain Valve must be depressed during several of the resetting steps, as well as during inspections, making certain that the Automatic Drain Valve is open.
When one or more automatic sprinklers operate in response to a fire, air pressure within the system piping is relieved through the open sprinklers. When the air pressure is sufficiently reduced, the water pressure overcomes the differential holding the Clapper Assembly closed and the Clapper Assembly swings clear of the water seat, as shown in Figure 2C, This action permits water flow into the system piping and subsequently to be discharged from any open sprinklers. Also, with the Clapper Assembly open, the intermediate chamber is pressurized and water flows through the alarm port (Ref. Figure 2B) at the rear of the DPV-1 Valve to actuate system water flow alarms. The flow from the alarm port is also sufficient to close the otherwise normally open Automatic Drain Valve in the valve trim.
After a valve actuation and upon sub- sequent closing of a system main control valve to stop water flow, the Clapper Assembly will latch open as shown in Figure 3D. Latching open of the DPV-1 will permit complete draining of the system (including any loose scale) through the main drain port.
During the valve resetting procedure and after the system is completely drained, the external reset knob can be easily depressed to externally unlatch the Clapper Assembly, as shown in Figure 2E. As such, the Clapper Assembly is returned to its normal set position to facilitate setting of the dry pipe sprinkler system, without having to remove the Handhole Cover. |
| | | Engineer | Дата: 29.09.2017, в 16:13 | Сообщение №10 |
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| Installation
General Instructions
Proper operation of the Model DPV-1 Dry Pipe Valve depends upon its trim being installed in accordance with the instructions given in this Technical Data Sheet. Failure to follow the appropriate trim diagram may prevent the DPV-1 Valve from functioning properly, as well as void listings, approvals, and the manufacturer warranties.
Failure to latch open the Clapper Assembly prior to a system hydrostatic test may result in damage to the Clapper Assembly.
The DPV-1 Valve must be installed in a readily visible and accessible location.
The DPV-1 Valve and associated trim must be maintained at a minimum temperature of 40°F (4°C).
Heat tracing of the DPV-1 Valve or its associated trim is not permitted. Heat tracing can result in the formation of hardened mineral deposits that are capable of preventing proper operation.
The Model DPV-1 Dry Pipe Valve is to be installed in accordance with the following criteria:
All nipples, fittings, and devices must be clean and free of scale and burrs before installation. Use pipe thread sealant sparingly on male pipe threads only.
The DPV-1 Valve must be trimmed in accordance with Figures 3, 4, or 5, as applicable. If the DPV-1 is to be equipped with a Dry Pipe Valve Accelerator, refer to the Technical Data Sheet TFP1105 for the VIZOR Electronic Dry Pipe Valve Accelerator or TFP1112 for the Model ACC-1 Mechanical Dry Pipe Valve Accelerator.
Care must be taken to make sure that check valves, strainers, globe valves, etc. are installed with the flow arrows in the proper direction.
Drain tubing to the drip funnel must be installed with smooth bends that will not restrict flow.
The main drain and drip funnel drain may be interconnected provided a check valve is located at least 12 inches (300 mm) below the drip funnel. The Low Body Drain Valve (Figure 3, 4, or 5) may be piped so as to discharge into the Drip Funnel or to a separate drain.
Suitable provision must be made for disposal of drain water. Drainage water must be directed such that it will not cause accidental damage to property or danger to persons.
Unused pressure alarm switch and/ or water motor alarm connections must be plugged.
The Pressure Relief Valve provided with the Valve Trim is factory set to relieve at a pressure of approximately 45 psi (3,1 bar), which can typically be used for a maximum normal sys- tem air pressure of 40 psi (2,8 bar). The Pressure Relief Valve may be reset to a lower or higher pressure;
however, it must be reset to relieve at a pressure which is in accordance with the requirements of the authority having jurisdiction.
To reset the Pressure Relief Valve, first loosen the jam nut and then adjust the cap accordingly clockwise for a higher pressure setting or counter-clockwise for a lower pressure setting. After verifying the desired pressure setting, tighten the jam nut.
Installation of an Air Maintenance Device, as described in the Technical Data Section, is recommended.
An Inspector’s Test Connection as required By NFPA 13 must be pro- vided on the system piping
Conduit and electrical connections are to be made in accordance with the requirements of the authority having jurisdiction and/or the National Electric Code.
Before a system hydrostatic test is performed in accordance with NFPA 13 system acceptance test requirements, the Clapper Assembly is to be manually latched open (Ref. Figure 2D); the Automatic Drain Valve (Figure 3, 4, or 5) is to be temporarily replaced with a 1/2 inch NPT plug, the 3/32 inch Vent Fitting (Item 13, Figure 3; Item 15, Figure 4; or Item 15, Figure 5) is to be temporarily replaced with a 1/4 inch NPT plug, and the Handhole Cover Bolts are to be tightened using a cross-draw sequence. |
| | | Engineer | Дата: 29.09.2017, в 16:14 | Сообщение №11 |
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| Valve Setting Procedure
Steps 1 through 11 are to be performed when initially setting the Model DPV-1 Dry Pipe Valve; after an operational test of the fire protection system; or, after system operation due to a fire.
NOTES: If the DPV-1 is equipped with a Dry Pipe Valve Accelerator, refer to its resetting instructions before resetting the DPV-1.
Refer to TFP1105 for the VIZOR or TFP1112 for the ACC-1.
Based on the instructions provided, reset the Accelerator at the appropriate time during the resetting of the DPV-1.
Unless otherwise noted, refer to Figure 3, 4, or 5 to identify functional trim components.
Step 1. Close the Main Control Valve, and close the Air Supply Control Valve. If the DPV-1 is equipped with a Dry Pipe Valve Accelerator, remove the Dry Pipe Valve Accelerator from service in accordance with its Technical Data Sheet (Refer to TFP1105 for the VIZOR or TFP1112 for the ACC-1).
Step 2. Open the Main Drain Valve and all auxiliary drains in the system. Close the auxiliary drain valves after water ceases to discharge. Leave the Main Drain Valve open.
Step 3. Depress the plunger of the Automatic Drain Valve to verify that it is open and that the DPV-1 Valve is completely drained.
Step 4. Open the Optional Alarm Control Valve, as applicable, if it was closed to silence local alarms.
Step 5. As necessary, replace all sprinklers that have operated. Replacement sprinklers must be of the same type and temperature rating as those which have operated.
In order to prevent the possibility of a subsequent operation of an over- heated solder type sprinkler, any solder type sprinklers which were possibly exposed to a temperature greater than their maximum rated ambient must be replaced.
Step 6. Push down on the Reset Knob (Figure 2E) to allow the Clapper Assembly to re-seat.
Step 7. Pressurize the system with air (or nitrogen) to 10 psi (0,7 bar), and then individually open all auxiliary drain valves in the system piping to drain any remaining water in trapped sections. Close each drain valve as soon as water ceases to discharge.
Also partially open the Low Body Drain Valve to assure that the riser is completely drained. Close the Low Body Drain Valve as soon as water ceases to discharge.
Step 8. Refer to Table B and then restore the system to the normal system air pressure as necessary to hold the DPV-1 Valve closed.
Step 9. Depress the plunger on the Automatic Drain Valve to make sure it is open and that there is no air discharging.
The absence of air discharging from the Automatic Drain Valve is an indication of a properly set air seat within the DPV-1 Valve. If air is discharging, refer to the Care and Maintenance section under Automatic Drain Valve Inspection to determine/correct the cause of the leakage problem.
Step 10. Partially open the Main Control Valve. Slowly close the Main Drain Valve as soon as water discharges from the drain connection.
Depress the plunger on the Automatic Drain Valve to make sure that it is open and that there is no water discharging. The absence of water discharging from the Automatic Drain Valve is an indication of a properly set water seat within the DPV-1 Valve. If water is discharging, refer to the Care and Maintenance section under the Automatic Drain Valve Inspection to determine/correct the cause of the leakage problem.
If there are no leaks, the DPV-1 Valve is ready to be placed in service and the Main Control Valve must then be fully opened.
Note: After setting a fire protection system, notify the proper authorities and advise those responsible for monitoring proprietary and/or central station alarms.
Step 11. Once a week after a valve is reset following an operational test or system operation, the Low Body Drain Valve (and any low point drain valves) should be partially opened (and then subsequently closed) to relieve drain back water. Continue this procedure until drain-back water is no longer present. |
| | | Engineer | Дата: 29.09.2017, в 16:15 | Сообщение №12 |
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| Care and Maintenance
The following procedures and inspections should be performed as indicated, in addition to any specific requirements of the NFPA, and any impairment must be immediately corrected.
Before closing a fire protection system main control valve for maintenance work on the fire protection system that it controls, permission to shut down the affected fire protection system must be obtained from the proper authorities and notify all personnel who may be affected by action.
The owner is responsible for the inspection, testing, and maintenance of their fire protection system and devices in compliance with this document, as well as with the applicable standards of the National Fire Protection Association (e.g., NFPA 25), in addition to the standards of any authority having jurisdiction. Contact the installing contractor or sprinkler manufacturer regarding any questions.
Automatic sprinkler systems are recommended to be inspected, tested, and maintained by a qualified Inspection Service in accordance with local requirements and/or national codes.
The operational test procedure and water flow pressure alarm test procedure will result in operation of the associated alarms. Consequently, notification must first be given to the owner and the fire department, central station, or other signal station to which the alarms are connected.
Annual Operation Test Procedure Note: Unless otherwise noted, refer to Figure 3, 4, or 5 to identify functional trim components.
Proper operation of the DPV-1 Valve (i.e., opening of the DPV-1 Valve during a fire condition) should be verified at least once a year as follows:
Step 1. If necessary, prevent water from flowing beyond the riser by:
Close the Main Control Valve
Open the Main Drain Valve
Open the Main Control Valve one turn beyond the position at which water just begins to flow from the Main Drain Valve
Close the Main Drain Valve
Step 2. Open the system Inspector’s Test Connection
Step 3. Verify that the DPV-1 Valve has operated, as indicated by the flow of water into the system and that all waterflow alarms operate properly.
Step 4. Close the system Main Control Valve.
Step 5. Reset the DPV-1 Valve in accordance with the Valve Setting Procedure.
Note: It is recommended that the requirement of NFPA 25 to annually inspect the inside of the valve be per- formed at this time and prior to reset- ting the DPV-1 Valve. Refer to the Automatic Drain Valve Inspection sub- section Steps 2 through 5 for instructions with regard to the inspection of the Clapper Facing. |
| | | Engineer | Дата: 29.09.2017, в 16:16 | Сообщение №13 |
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| Quarterly Waterflow Alarm Test Procedure
Testing of the system waterflow alarms should be performed quarterly. To test the waterflow alarm, open the Alarm Test Valve, which will allow a flow of water to the Waterflow Pressure Alarm Switch and/or Water Motor Alarm. Upon satisfactory completion of the test, close the Alarm Test Valve.
Water Pressure Inspection
The Water Pressure Gauge is to be inspected monthly (per NFPA 25) to ensure that normal system water pres- sure is being maintained.
Air Pressure Inspection
The Air Pressure Gauge is to be inspected monthly (per NFPA 25) to ensure that normal system air pressure is being maintained.
Automatic Drain Valve Inspection The Automatic Drain Valve should be inspected monthly (per NFPA 25) by depressing the plunger and checking to ensure that the Automatic Drain Valve is not discharging water and/or air. A discharge of water and/or air is an indication that the air and/or water seats are leaking, which could subsequently cause a false operation should the intermediate chamber become inadvertently pressurized.
If leakage is present, take the DPV-1 Valve out of service (i.e., close the main control valve, open the main drain valve, close the air supply control valve, remove the Dry Pipe Valve Accelerator from service, as applicable, in accordance with its Technical Data Sheet (Refer to TFP1105 for the VIZOR or TFP1112 for the ACC-1), and open the Inspector’s Test Connection to relieve the system air pressure to 0 psig as indicated on the System Air Pressure |
| | | Engineer | Дата: 29.09.2017, в 16:17 | Сообщение №14 |
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| Gauge and then after removing the Handhole Cover, perform the following steps:
Step 1. Make sure that the Seat Ring is clean and free of any nicks or significant scratches.
Step 2. Remove the Clapper Assembly from the valve by first pulling out the Hinge Pin.
Step 3. Disassemble the Clapper Facing Retainer from the Clapper so that the Clapper Facing can be removed and inspected. Make sure that the Clapper Facing does not show signs of compression set, damage, etc. Replace the Clapper Facing if there is any signs of wear.
Step 4. Clean the Clapper Facing, Clapper, and Clapper Facing Retainer, and then reassemble the Clapper Assembly.
Step 5. Reinstall the Clapper Assembly with its Hinge Pin.
Step 6. Install Handhole Cover: |
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