FW MURPHY DVU2105 DVU Series Dump Valves User Manual

DVU Series Dump Valves
Model: DVU150, DVU175, DVU2105, DVU2115 and DVU2120
Installation and Operation Manual

Please read the following information before installing. Visually inspect the product for shipping damage at receiving. It is your responsibility to have a qualified person install this unit and make sure it conforms to local codes. The training, qualification, and experience required are for work around pressure vessels, natural gas, possibly sour gas or any substance to be found in the vessel.
WARNING Before installation of this product:

• Disconnect all electrical power to the machine
• Ensure the machine cannot operate during installation
• Follow the safety warnings of the machine manufacturer
• Read and follow all installation instructions

Specifications

Operating Temperature: -30° F to 250° F (-34.4° C to +121° C)
Valve Operating Pressure: See How to Order
Maximum Working Pressure:
DVU150/175 (STD & SS): 1800 psi (12.4 MPa) [124 bar] DVU2105: 500 psi (3.44 MPa) [34 bar] DVU2115: 1500 psi (10.3 MPa) [103 bar] DVU2120: 2000 psi (13.8 MPa) [138 bar] Shipping Weights:
DVU150 and DVU175: 9 lbs. (4 kg)
DVU150SS and DVU175SS: 9 lbs. (4 kg)
DVU2105, DVU2115, DVU2120: 14 lbs. (6.4 kg)
Shipping Dimensions: 8 x 8 x 12 in. (203 x 203 x 305 mm)
Wetted Parts
Standard Models:
Body/Union Nut: 12L14 carbon steel, electroless nickel-plated
Stem: ANSI 303 SS
Stuffing Box: ANSI 303 SS
Seat: ANSI 303 SS
Plug/Seal: ANSI 303 SS / 95 durometer urethane
Stainless Steel Models:
Body/Union Nut: ANSI 316 SS
Stem: ANSI 316 SS
Stuffing Box: ANSI 316 SS
Seat: ANSI 316 SS
Plug/Seal: ANSI 316 SS / 95 durometer urethane
Models

Model DV| Inlet| Outlet| Trim Size inches (mm)| Working Max. Press.
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2120| 2 NPT| 1 NPT| 0.500 (12.7)| 2000 psi
2115| 0.571 (14.5)| 1500 psi
2105| 0.791 (20.09)| 500 psi
175| 1 NPT| 3/4 NPT| 0.359 (9)| 1800 psi
175SS
150| 1/2 NPT
150SS

Description
The DVU Series models are pneumatically controlled dump valves. The valves open and close automatically by pneumatic control from an FW Murphy LS200NDVOR or similar level controller and dump valve operator. Diaphragm actuated, the DVU series dump valves operate at 30–70 psi (207–483 kPa) [2.07–4.83 bar] and up to 2000 psi (13.8 MPa) [138 bar] vessel pressure (depending on model). A key benefit of this design is the hex union that provides the ability to replace the seat without removing the valve from the piping.
Dimensions

DVU 150 and175

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DVU 2105, 2115 and 2120

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Typical Installation of Gas Compressors and Basic Operation

As condensate rises in the scrubber, the float on the pneumatic level control rises and trips its pneumatic valve. The valve opens, allowing pressure to enter the dump valve pilot chamber. Once the pressure enters the pilot chamber it forces the diaphragm and valve stem forward, thus opening the valve seat (valve open/closed indicator button pops out) and releasing condensate through the valve stem and out the drain. As the condensate level drops, the pneumatic level control valve closes to shut off the pressure to the dump valve, causing it to close.
If for any reason the condensate continues to rise beyond normal dump levels, the high-level shut-down switch operates the alarm and/or shuts down the equipment. The filter/regulator and gauge help keep the control pressure clean and dry. They also allow the operator to adjust the pressure to recommended levels.
Note: Always use clean, dry, instrument quality gas.

Typical Dump Valve Installation

CAUTION: Always use non-sparking tools when gas is known to be present.
Direct Mounting Method to Tank Wall

1. Install the valve so the drain connection is on the bottom. Use pipe thread sealant on all the connections.
2. Be sure the unit is screwed tight and does not leak.
3. Install the piping for the pneumatic input signal into the 1/8 NPY threaded connection of the pressure inlet port (on top of the diaphragm housing of the DVU).
4. Install a union between the DVU drain connection and the condensate outline. Use pipe thread sealant on all the connections.

Repair Procedure

CAUTION: Use extreme care to ensure any residual or full pressure is relieved from all parts of the system to be serviced.
Replacing the Plug and Seat

1. Close the pressure block valves (suction and discharge valves) on the inlet and outlet of the skid. Lock them closed if possible.

2. Open the blowdown valve to remove pressure from the unit. Lock the blowdown valve open if possible.

3. After taking all possible precautions to ensure there is no pressure in the vessel, (If the condensate line is pressurized, it must also be blocked and locked.) open the manual drain valve so it bleeds into the vessel so it can also be bled down.
   Disconnect the pneumatic input signal connection after ensuring it also has been depressurized. See illustrations on page 2.

4. Using the backup wrench on the valve body, with a quick breaking action, loosen the union nut on the valve. There is a weep hole in the nut. If at any time (while loosening and taking off the nut) pressure is escaping through the weep hole, immediately stop loosening the nut. Retighten the nut and check the preceding procedures to ensure the pressure is bled off the vessel. Never remove the assembly if pressure is coming through the weep hole. See illustrations on page 2.

5. With the upper assembly removed from the vessel, the plug and/or seat can be replaced. Loosen the 9/16 in. jam nut on the maintenance bolt on top of the diaphragm cover. Spin the nut up against the head of the bolt. Tighten the bolt to extend the shaft and plug. Do not over-tighten.

6. Using the backup wrench on the plug, remove the stem nut on the shaft under the plug. Once the stem nut is broken loose, the 9/16 in. head maintenance bolt and top assembly will keep the stem from turning. The plug turns freely on the stem once loose.
   The plug and the stem can now be removed. All soft seals should be replaced. Refer to How to Order.

7. If the diaphragm or stem needs to be replaced, do steps a–k in the procedure Replacing the Stem or Diaphragm. Otherwise, proceed with steps 8–11.

8. Install the seat and plug. Place the O-ring on the stem followed by the washer and stem nut.

9. Tighten the stem nut. Loosen the 9/16 in. head maintenance bolt by at least one turn past the point where it is no longer in contact with the stem. Tighten head aintenance bolt.

10. Replace the crush washer and the O-ring hidden by the union nut. NOTE: If pressure or fluid comes out of the weep hole of the union nut, either the O-ring under the union nut is leaking or the packing could be leaking through the internal weep hole above that O-ring.

11. The assembly is ready to be reinstalled. Check for the relative position of the pneumatic input signal connections before tightening the union nut. See the Torque Specification table.

Torque Specification

Description| Foot Pounds
Jam Nut| 20 ft-lb. (27 Nm)
1/2 in. Nut| 11 ft-lb. (15 Nm)
Diaphram Bolt/Nut (8)| 80 in-lb. (9 Nm)
Union Nut DVU 150/175| 260 ft-lb. (353 Nm)
Union Nut DVU 2105/2115/2120| 350 ft-lb. (475 Nm)

Replacing the Stem and/or Diaphragm
Only do the following steps if the diaphragm or stem needs to be replaced and after completing steps 1–7 in the procedure Replace the Plug and Seat.
a. Loosen the 9/16 in. head maintenance bolt allowing the diaphragm spring to relax and the stem to retract. Make alignment marks on the top and bottom halves of the diaphragm assembly for alignment during reassembly.
b. Remove the eight 7/16 in. bolts/nuts holding the diaphragm housing together.
c. Using a straight edge screwdriver, gently separate the two halves of the diaphragm housing and remove the top or outside portion.
d. Lift the diaphragm and support plate far enough for the 1-1/8 in. hex or 1 in. round nut on the bottom of the diaphragm assembly to be accessible to a wrench and not have the spring interfere.
If it is desired to replace the packing and or stem, pull the stem all the way out. The packing can easily be removed by using a small screwdriver to pry the packing out. The new packing can be simply pressed in, making sure the orientation of the packing installed is the same as the orientation of the packing removed. The packing is wider toward the plug end. You will have to use the seat to hold the packing in place when re-inserting the stem.
e. With the 1-1/8 in. hex or 1 in. round nut held by a wrench, use a wrench to loosen and remove the 1/2 in. nut on top of the diaphragm. The diaphragm, plate, and stem can now be removed and replaced.
f. With the new diaphragm in place and the 1/2 in. nut tightened, place the assembly with the diaphragm down on a clean and smooth sturdy surface.
g. Have the seat, pug, washers, and stem nut handy (if any of these are to be replaced use the old parts for this procedure). Press down evenly and smoothly on the bottom of the diaphragm assembly to cause the stem to come up. Place the set and plug it in place. Then push the bottom of the diaphragm assembly down far enough to install the washers and stem nut on the stem.
Tighten the stem nut enough to hold against the diaphragm spring.
h. Align the diaphragm holes to the bolt holes (bottom half of the housing). Install the upper diaphragm housing using the alignment marks from removal. Install the eight 7/16 in. bolts and nuts. Tighten the bolts evenly using an X-pattern until all eight bolts are evenly tight. See the Torque Specification table.
i. Using the 9/16 in. head maintenance bolt, tighten, pushing the stem out until the 9/16 in. bolt stops. Do Not Overtighten.
j. Remove the stem nut holding the plug.
k. If old parts were used, prepare to install the new parts now.
Follow steps 8-11 in the procedure Replacing the Plug and Seat.

Control Pressure vs. Working Pressure

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Pressure vs. Flow (DVU-150/175)

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How to Order

Use Model Number

| DVU2120|
DVU2115|
DVU2105|
DVU175|
DVU175SS|
DVU150|
DVU150SS|
55000272| DVU2120 Seal Kit| Service Parts
55000273| DVU2120 Diaphragm Kit
55000271| DVU2115 Seal Kit
55000273| DVU2115 Diaphragm Kit
55000270| DVU2105 Seal Kit
55000273| DVU2105 Diaphragm Kit
55000230| DVU150/175 Seal Kit
55000231| DVU150/175 Diaphragm Kit
55000255| DVU150/175 End Seal Kit
55000262| DVU150SS/175SS Seal Kit
55000231| DVU150SS/175SS Diaphragm Kit
The DVU Series Valve is included in the following Scrubber Levels Systems.
(Includes LS200, LS200NDVOR, and DVU valve)
SLS2120: Includes DVU2120 valve
SLS2115: Includes DVU2115 valve
SLS175: Includes DVU175 valve
SLS150: Includes DVU150 valve
-LR: Less regulator option| (Includes MLS-020, LS200NDVOR, and DVU valve)
MSLS2120: Includes DVU2120 valve
MSLS175: Includes DVU175 valve
MSLS150: Includes DVU150 valve
-LR: Less regulator option
-TF: The test function option is available with MSLS150
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