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5.7 MV3 Valve (abrasive metering valve)

The MV3 Valve (#14) is used to control (meter) abrasive flow by use of an adjustable orifice.

The size of this orifice is controlled by turning the knob at the top of the MV3 Valve. Turning

the knob clockwise reduces the orifice size which decreases abrasive flow. Turning the knob

counterclockwise increases the orifice size which will increase the abrasive flow to the blast

nozzle (#11). Adjustments to the abrasive flow should be made by turning the knob a little at a

time. Test the adjustment by starting the blast for a short period to determine if further

adjustment is needed. The MV3 Valve has an orifice indicator on the body to use as reference

as to the amount the orifice is open.

Note:

For proper operation, the MV2® abrasive flow must

be in the direction of the base arrow (see Section 9.5(a)). However, this does not apply to MV3.

The MV3 Valve has a cleanout port used to purge trash that blocks abrasive flow. This is done

by removing the clean out cap and pressing down the deadman lever (#12). The blast air flow

purges trash through the clean out (see Section 11.3.2). The cleanout is then reinstalled for

operation.

Airborne particles and loud noise hazards from purged air can cause serious injury and loss of

hearing. Wear approved eye and ear protection. Stay clear of purge air path. DO NOT place hands

or other body parts in the purge air path. Make sure no personnel are in the purge air path.

5.8 Deadman Valve/Switch (blast control)

The Deadman valve/switch is part of the system that controls the blast operation. The deadman

allows the operator to remotely start and stop the blast operation. The deadman is mounted at

the end of the blast hose assembly (#10) near the blast nozzle (#11) to give the operator easy

control of the blast operation.

The Deadman is either a pneumatic valve or an electric switch depending on the type of

abrasive blaster control system. When the deadman lever is pressed down it sends either a

pneumatic or electric signal to the ComboValve®. The ComboValve opens and starts the blast

operation. See Sections 9.1, 9.2, 9.3, 9.8, and 9.9.

5.8.1.

Pneumatic Deadman System:

When the pneumatic deadman (#12) lever is pressed

down, air supply from the orange hose of the twinline hose (#15) flows into the black

hose. Air flows through the black hose to the signal port of the ComboValve (#4) to

open it and send air into the abrasive blaster and blast air hose. When the deadman lever

is released, the air signal is cut off and the ComboValve is closed to shut off the supply

air and depressurize the blaster through the blowdown hose assembly (#9). See Figure

5.3 and the drawings in Sections 9.1 and 9.2.

Figure 5.3 – MV3/Combo Pneumatic Deadman Blast Control System

Summary of Contents for MV3

Page 1: ...BLE TO ALL USERS OF THIS EQUIPMENT Manual Part Number 7200 200MV Scan QR tag below for downloading from SchmidtAbrasiveBlasting com Copyright 2021 AXXIOM Manufacturing Inc 11927 S Highway 6 Fresno Texas 77545 800 231 2085 281 431 0581 fax 281 431 1717 Visit us at www SchmidtAbrasiveBlasting com Website Manual ...

Page 2: ...blaster vessel before loading abrasive or performing any maintenance 6 Do Not use abrasives containing free silica Silica can cause silicosis or other related respiratory damage All operators must wear personal protective equipment for all abrasive blasting operations Observe all applicable local state and federal safety regulations in conjunction with airline filters and respiratory protection Re...

Page 3: ...in this manual Please familiarize yourself with the following terms and refer to them as needed while reading this manual Term Definition Pressure Vessel A fabricated tank or reservoir that is part of the abrasive blaster which is filled with compressed air and abrasive Also referred to as blast vessel or vessel Pressurize To fill the abrasive blast vessel manually or automatically with compressed...

Page 4: ...on 6 2 and 6 3 4 1 7031 057 Warning Read manual before using this machine Read and understand operator s manual before using this machine Failure to follow operating instructions could result in injury or damage to equipment See Section 1 0 5 1 7031 077 Warning Pinch point hazard Vessel pressurization will close popup Closing popup can pinch and crush Keep hands and fingers away from popup 6 1 703...

Page 7: ...sonal Protective Equipment 19 4 0 Abrasive Blast System General Operation 26 5 0 MV3 Blast System General Operation 27 6 0 Pre operation Procedures 37 7 0 Operating Instructions 42 8 0 Maintenance and Inspection Instructions 46 9 0 Drawings and Parts Lists 52 10 0 Recommended Spare Parts Lists 69 11 0 Troubleshooting 70 12 0 Warranty and Reference Information 73 13 0 Blasting Data Tables Back Cove...

Page 8: ...ULT IN SERIOUS INJURY OR DEATH TO OPERATING PERSONNEL OR PERSONS IN THE OPERATING VICINITY 1 2 KNOW YOUR EQUIPMENT Do Not operate this equipment in a manner other than its intended application see Section 4 0 Do Not operate this equipment or any other Schmidt equipment without following the Rules for Safer Operation and all the operating procedures and instructions Learn the applications and limit...

Page 9: ...0 134 Abrasive blasting produces dust which may contain silica and other toxic substances that can cause severe and permanent lung damage cancer and other serious diseases if inhaled All operators and personnel in the vicinity must wear OSHA approved respiratory protection during the operation of this equipment See Sections 3 9 3 10 and OSHA 29 CFR 1910 134 1 7 BREATHING AIR QUALITY Do Not use bre...

Page 10: ...te this equipment when you are tired or fatigued Use caution and common sense while operating and or performing maintenance on this equipment 1 12 DO NOT USE DRUGS ALCOHOL or MEDICATION Do Not operate this equipment while under the influence of drugs alcohol or any medication 1 13 PROTECT BYSTANDERS Do Not allow blast equipment operators and other personnel to enter the vicinity of the blast opera...

Page 11: ...without proper ventilation Consult plant authorities OSHA 29 CFR 1910 146 and 1910 94 1 21 ELECTRICALLY GROUND EQUIPMENT Static electricity is generated by the abrasive flow through the blast hose and or vacuum hose To minimize chance of static electrical shock to operating personnel only use anti static blast hose and or vacuum hose properly electrically bond the blast nozzle blast hose couplings...

Page 12: ...inspected and or repaired by a qualified facility Contact Axxiom Manufacturing Inc for technical support 1 30 INSPECT VESSEL REGULARLY Do Not operate this equipment with damage to the pressure vessel It is not safe Inspect outside and inside of the pressure vessel regularly for corrosion or damage i e dents gouges or bulges If damaged take out of service immediately and have it inspected and or re...

Page 13: ...icle of dirt from the air hose can plug the bleed hole in the deadman valve and cause the blast outlet to turn on 1 37 CHECK FOR DAMAGED PARTS Do Not use this equipment with damaged components Periodically check all valves hoses fittings pipe and pipe fittings internal and external to confirm that they are in good condition Repair or replace any component that shows any sign of wear leakage or any...

Page 14: ...PERATION IMMEDIATELY IF ANY ABNORMALITY IS DETECTED Do Not operate this equipment if anything abnormal is seen during operation Stop operation immediately for inspection Refer to Section 8 0 for maintenance and inspection details 1 45 DO NOT OVERLOAD THE LIFT EYES Do Not load the lifting eyes above the rated capacity Do Not lift the blast vessel by any point other than the lifting eyes or designat...

Page 15: ...d accessories available for Schmidt abrasive blasters visit the Axxiom website or contact us Axxiom Manufacturing Inc 11927 South Highway 6 Fresno Texas 77545 Phone 1 800 231 2085 Fax 1 281 431 1717 Website www SchmidtAbrasiveBlasting com 2 2 Abrasive Blaster Operational Specifications Maximum Working Pressure 125 or 150 psig 250 F see ASME nameplate All abrasive blasters manufactured after Februa...

Page 16: ... National Board R Stamp and or an ASME U stamp depending on state or city law Welding on the vessel performed by welders not properly qualified per the ASME Code may void the ASME NB integrity of the vessel 2 5 Notes 2 6 Abrasive Blaster Lifting Diagrams and Dimensional Specifications An abrasive blaster is a Pressurized Vessel The compressed air inside a pressurized vessel contains a dangerously ...

Page 19: ... blasters 3 5cf and larger are provided with mounting holes in the leg base These holes can be used for securing the blaster to the floor or mounting structure 3 2 Compressed Air Requirements blast nozzle The blast nozzle size and blast pressure determine the compressed air requirements Available air flow capacity and or air compressor size must be considered before selecting the blast nozzle size...

Page 20: ... them External loading at piping connection can cause damage and possible failure of the pressure vessel Hard piping connected to the pressure vessel must include supports to eliminate the possibility of applying loads on the pressure vessel 3 5 Blast System Air Pressure The maximum allowable working pressure MAWP for the blast unit is stamped on the ASME nameplate attached to the vessel For most ...

Page 21: ...moisture separator air cooled aftercooler or deliquescent dryer Contact a local authorized Schmidt distributor or Axxiom Manufacturing Inc to locate one near you 3 7 Electrical Requirements On units equipped with electric blast controls the supply voltage is 12Vdc or 24Vac The maximum power required is 1 outlet 7 watts 1 outlet with abrasive cutoff 14 watts 2 outlet 14 watts 2 outlet with abrasive...

Page 22: ...operating personnel Always use abrasives containing less than 1 of crystalline silica Always use a NIOSH approved respirator when handling loading and cleaning up abrasives Organic substances which are combustible may only be used in automated blast systems with ventilation that meets OSHA 29 CFR 1910 94 3 9 Breathing Air Quality All blast operators must be supplied with and required to use NIOSH ...

Page 23: ...nd supplied to each operator Reference 29 CFR 1910 Subpart I OSHA requires that this equipment meet or be equivalent to standards developed by the American National Standards Institute ANSI Figure 3 10 below identifies the minimum personal protective equipment required for each abrasive blast operator Also identified are the OSHA references for each and the ANSI standard each PPE item must meet Al...

Page 24: ...mum allowable working pressure of the abrasive blaster pressure vessel See the ASME CE vessel nameplates attached to the pressure vessel Rupture Hazard Operating the pressure vessel above the maximum allowable working pressure can result in rupturing the pressure vessel Install an air pressure relief valve to protect against over pressurization of the blast vessel Airborne particles and loud noise...

Page 25: ...s Air supply connection install air supply piping or connect an air supply hose that is the same size as the blaster piping size or larger See Section 3 4 for details Air quality install moisture separator or AirPrep System to remove moisture from blast air supply to protect against abrasive flow problems See Section 3 6 Electric power provide power source for electric deadman controls See Section...

Page 26: ...from the air compressor Since moisture creates problems in the blast operation it is common for the compressed air to be fed through a moisture removal device such as a Schmidt AirPrep System The air pressure in the abrasive blast vessel is equal to the air pressure in the blast hose where it connects at the metering valve This equal pressure is needed to allow the blast abrasive to flow downward ...

Page 27: ... blast vessel internal piping The air flow pushes the popup 5 against the gasket 6 to seal the abrasive inlet and allow the air flow to pressurize the blast vessel 1 and the blaster piping 13 Blasting starts when the deadman lever 12 is pressed down Compressed air will flow from the ComboValve 4 to the blast hose 10 The choke ball valve 13 must be open during the blast operation Abrasive will flow...

Page 28: ...eter as the air supply piping and rated at a minimum of 150psi operating pressure See the drawings and parts lists in Section 9 0 and refer to Sections 3 4 and 5 12 5 3 Air Inlet Ball Valve The air inlet ball valve 3 is used to turn on and turn off the air flow to the abrasive blaster When the inlet ball valve is opened air will flow through the moisture separator 7 and into the ComboValve 4 In a ...

Page 29: ...aust air can cause serious injury and loss of hearing Wear approved eye and ear protection Stay clear of blowdown air path DO NOT place hands or other body parts in the blowdown air path Make sure no personnel are in the blowdown air path Note All Schmidt MV3 Combo blasters except for 1 5cf are equipped with the VBS II Volumetric Blowdown Suppression System which reduces noise level and floor dama...

Page 30: ...injury and loss of hearing Wear approved eye and ear protection Stay clear of purge air path DO NOT place hands or other body parts in the purge air path Make sure no personnel are in the purge air path 5 8 Deadman Valve Switch blast control The Deadman valve switch is part of the system that controls the blast operation The deadman allows the operator to remotely start and stop the blast operatio...

Page 31: ...blasters with electric deadman blast control systems must operate on low voltage supply 12 24 volts To minimize shock hazard only use low voltage sources and use caution when connecting the power to the abrasive blaster See Section 3 7 Figure 5 4 MV3 Valve Electric Deadman Blast Control System 5 9 MV3 Valve Abrasive Blaster with Electric Control System Figure 5 5 shows a MV3 Valve abrasive blaster...

Page 32: ...ount of air flow and abrasive determine how quick blasting can be done The larger the nozzle the more air and abrasive will be needed The larger the nozzle size the greater the blast productivity However for a fixed amount of air supply increasing the nozzle size will reduce the blast pressure For best performance the blast pressure must be maintained as high as possible Therefore select the nozzl...

Page 33: ... End Ball Valve 5 14 Thompson Valve Tera Valve Conversion The MV3 Valve abrasive blaster is best suited for large blast projects where the operator will blast for long periods without repeated starts and stops Because the MV3 blaster is a depressurized blast system all the air pressure in the blast vessel is vented each time the deadman lever is released When blasting is restarted differential pre...

Page 34: ...air and abrasive mixture The VBS II self cleaning urethane exhaust cap design absorbs the abrasive impact to reduce wear on the internal components and prevents clogging The standard blowdown hose must be shortened to 14 1 2 to accommodate the VBS II System Note The VBS is standard on MV3 ComboValve package blasters manufactured after June 2011 except for 1 5cf Conversion kits are available for fi...

Page 35: ...sters and has vertical adjustment to fit any valve configuration Blast vessels manufactured after September 2016 are equipped with holes in the legs and handle for installing the load skid See Figure 5 8 5 17 2 Hinged lid The new hinged lid released in 2016 is a design that mounts on the handle of portable vessels The hinged lid is equipped with a spring pin that locks the lid in the open and clos...

Page 37: ...ic electrical shock to operating personnel only use anti static blast hose properly electrically bond the blast nozzle blast hose couplings and the equipment and properly install an earth ground to the abrasive blaster See Section 5 10 6 1 3 Do Not operate this equipment without a pressure relief device in place The ASME Code requires that all vessels be provided with pressure relief devices See S...

Page 38: ...dental disconnections during operation See Sections 5 12 and 8 7 Failure to install safety pins on all blast hose couplings can result in hose disconnects and could result in serious injury or death See Sections 5 12 and 8 7 6 1 11 Connect the twinline hose quick disconnects 18 19 or the electric deadman extension cord to the mating disconnect s 16 17 on the abrasive blaster piping 6 1 12 Close th...

Page 39: ...rized When the popup valve opens after depressurizing abrasive can be blown out of the blast vessel and into the face and eyes of the operator Wear OSHA approved safety glasses See Section 3 10 6 2 3 Close the air inlet ball valve 3 to disable the blaster and the deadman blast control The ball valve is closed when the handle is fully turned to the position shown in Figure 6 2 handle perpendicular ...

Page 40: ...way weld ring sealing surface inside the vessel Inspect the handway cover sealing surface Both surfaces must be smooth 6 3 4 Place the gasket on the handway cover then fit both through the opening 6 3 5 Place the cover and gasket in position against the inside edge of the handway weld ring Apply a pulling force to hold in position then proceed See Note below 6 3 6 Center the gasket on the handway ...

Page 41: ...Figure 6 3 b Handway Components 6 x 8 Handway Dimensions Component A B Weld Ring 6 5 8 8 1 2 Handway Cover 7 5 8 9 3 4 Handway Gasket 7 3 4 9 3 4 SureFit Gasket 8 1 16 10 5 16 Handway Crab 2 3 8 8 3 4 Square Head Bolt 3 4 10 UNC 4 1 2 Table 6 3 c Handway Component Dimensions ...

Page 42: ... dropped open The open popup indicates that the blast vessel is depressurized See Figure 7 1 7 1 3 Fill the blaster with dry abrasive though the abrasive inlet 6 Pass recycled abrasive through the screen 30 to remove trash Do not over fill the blast vessel An excessive amount of abrasive piled above the popup 5 after the blast vessel is full may prevent the popup from sealing properly Pinch point ...

Page 43: ...essure and nozzle size therefore it may take more than one adjustment to achieve the desired air abrasive mixture Further adjustment can be made later as needed 7 2 6 Slowly open the inlet ball valve 3 This will supply air to the ComboValve 4 and the deadman controls 12 15 The blast vessel will not pressurize 7 2 7 Slightly open the ball valve 8 on bottom of the moisture trap 7 to permit moisture ...

Page 44: ...ve for different applications 7 2 13 Re test the blast air and abrasive mixture again on a test piece to determine is further adjustment is needed 7 2 14 At initial blasting have an assistant check the popup handway hoses and piping for leaks while the blaster is pressurized Periodically check for leaks thereafter 7 2 15 Release the deadman lever to stop blasting The MV3 Valve blaster will depress...

Page 45: ...valve after draining 7 3 3 Completely depressurize the abrasive blast vessel 1 MV3 Valve blasters automatically depressurize when the deadman valve 12 is released to stop blasting See Section 6 2 for blowdown procedure Airborne particles and loud noise hazard from the blowdown exhaust air can cause serious injury and loss of hearing Wear approved eye and ear protection Stay clear of blowdown air p...

Page 46: ...rrosion is found have the abrasive blast vessel inspected by a qualified facility Contact Axxiom Manufacturing Inc for technical support Refer to the ASME Data Report for the vessel minimum thickness Check the pressure vessel internal piping for corrosion cracks wear holes or any other damage Repair or replace damaged components See Figure 8 1 and Section 9 11 8 4 Popup Assembly The popup alignmen...

Page 47: ...the blast hose assembly for soft spots caused by wear To protect against serious injury to personnel replace blast hoses with soft spots Note Static electricity is generated by the abrasive flow through the blast hose To protect against static electrical shock to operating personnel only use static dissipating blast hose and properly ground the abrasive blaster Worn blast hose assemblies can ruptu...

Page 48: ...result in serious injury or death Figure 8 2 Hose Connection Disconnect Protection 8 8 Blast and Air Hose Gaskets All air hose blast hose and threaded couplings have gaskets that seal the connection To reduce loss of air pressure and or premature abrasive wear replace these gaskets when leaks are found Inspect the couplings daily for leaks and wear Replace gaskets when visible wear or leaks are fo...

Page 49: ...nt components that are not Schmidt original factory replacement parts may result in equipment failure which can result in serious personal injury Figure 8 4 MV3 Valve Abrasive Blaster with pneumatic blast controls 8 11 ComboValve Blowdown Hose The blowdown hose 9 that passes through the ComboValve 4 is a 3 4 blast hose Abrasive carry over will thin the blowdown hose wall and eventually wear a hole...

Page 50: ... personal protective equipment could result in serious injury or death 8 14 Warning Decals Check monthly to verify that all the warning decals are in position and legible See Section 0 0 for full descriptions and locations Failure to maintain warning decals risks the possibility of not alerting the abrasive blaster operator to potential dangers which can result in serious injury or death See Secti...

Page 51: ...heck pipe pipe fittings for wear cracks or air leaks See Section 8 6 X Remote Control Wires Check wiring for bare spots fraying cuts or cracks See Section 8 6 X Blast Air Hose Couplings Check for safety pins and whip checks See Section 8 7 X Hose Coupling Gaskets Check for leaks at the air blast and threaded hose coupling gaskets See Section 8 8 X Blast Nozzle Check blast nozzle threads and jacket...

Page 52: ...he abrasive blast system is equipped with pneumatic or electric controls then reference the appropriate drawing and parts list to determine the required parts To ensure the proper operation of the blast system only install Schmidt original factory replacement parts furnished by an authorized Schmidt distributor See Section 1 39 and Section 12 2 12 9 0 Drawings and Parts Lists ...

Page 65: ...65 Copyright 2021 Axxiom Manufacturing Inc 9 9 Deadman Switches Electric Electric shock hazard To minimize shock hazard use electric deadman in low voltage applications only 12 24 volts ...

Page 68: ...of the popup Abrasive piled on top of the popup restricts movement and can prevent the popup from properly sealing Pour abrasive into the vessel top head and allow it to flow in and form the areas of dead abrasive above the spider plate and to the sides as shown above The gap should be approximately 1 4 The spider spacers can be removed to lower the spider disk The spacers can be cut shorter if ne...

Page 69: ...6 2 4205 10X Hose insert specify size 36 10 4205 10X 99 Insert gasket 37 2 4235 00X Hose clamp double bolt for field installation specify size 38 10ft 4102 00X Air hose specify size 39 20 7119 002 Safety Pin Air Blast Hose Coupling 40 2 8710 98778 Hose whip check 41 1 7031 999 02 Safety decal kit See Section 0 0 1 2408 907 Union end ball valve optional See Section 5 13 B ITEMS FOR PNEUMATIC CONTRO...

Page 70: ...o deadman valve 12 are crossed 2 Non Schmidt deadman 12 has been installed 3 Control valve 20 stuck in the ON position MV3 Electric only 4 Blocked twinline hose 5 Defective deadman valve 12 Pneumatic deadman cartridge plunger stuck in the ON position down Cartridge plunger is visible below deadman handle 6 Defective or broken ComboValve 4 spring 7 Defective ComboValve 4 lower rod guide seal 11 1 3...

Page 71: ...ging the nozzle orifice 11 Release deadman and allow the air pressure in the blast hose 10 to dissipate Close the air inlet ball valve 3 then remove the blast nozzle 11 and clear blockage Do Not aim the blast nozzle towards yourself or any person A system malfunction or a blocked blast nozzle that clears can trigger accidental start up resulting in injury to personnel 11 2 4 Blast is slow to turn ...

Page 72: ...igh pressure above low pressure below The higher pressure from the blast vessel should be enough to loosen the trash blocking the abrasive valve orifice and blast it through the blast nozzle 11 To minimize excess wear of the MV3 Valve keep the choke valve fully open during normal blasting Note Trash cleared during the choking process may block the nozzle orifice Refer to Item 8 in Section 11 2 4 f...

Page 73: ...use negligence corrosion erosion normal wear and tear alterations or modifications made to the machine without express written consent of Axxiom Manufacturing Inc 4 Warranty requests must be submitted in writing within thirty 30 days after failure 5 Written authorization to return merchandise under warranty must first be obtained from Axxiom Manufacturing Inc In no case shall merchandise to be ret...

Page 74: ...AL DAMAGES RESULTING FROM THE USE OF THE PRODUCT OR ARISING OUT OF ANY BREACH OF ANY WARRANTY OR FOR ANY SPECIAL OR CONSEQUENTIAL DAMAGES OF ANY CHARACTER INCLUDING WITHOUT LIMITATIONS DAMAGES FOR ANY LOSS OF GOODWILL WORK STOPPAGE OR ANY AND ALL OTHER COMMERCIAL DAMAGES OR LOSSES 15 AXXIOM MANUFACTURING INC MAKES NO OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING BUT NOT LIMITED TO THE IMPLIED WA...

Page 75: ...following contact information Answers to most any safety related questions can be found at the OSHA website shown below Phone 1 800 321 6742 Website www osha gov U S Department of Labor Occupational Safety and Health Administration 200 Constitution Avenue NW Room Number N3626 Washington D C 20210 National Institute of Occupational Safety and Health NIOSH is a federal agency responsible for conduct...

Page 76: ... Content No of Recycles Initial Cost Typical Use Corn Cobs 2 angular 35 45 tan none 4 5 low stripping paint from delicate substrates Sodium Bicarbonate 2 8 crystal 60 white none 4 5 medium cleaning and stripping paint from delicate substrates Walnut Shell 3 angular 45 lt brown none 4 5 low stripping paint from delicate substrates Plastic 3 2 angular 45 60 white none 8 10 medium Paint stripping deb...

Page 79: ...ction Guide blasting 100 Psi NOZZLE SIZE No 4 1 4 No 5 5 16 No 6 3 8 No 7 7 16 No 8 1 2 CFM 100psi 90 140 200 270 350 AIR HOSE 1 1 4 1 1 4 1 1 2 1 1 2 2 BLAST HOSE 1 1 1 4 1 1 4 1 1 2 1 1 2 ABRASIVE lbs per hr 560 900 1260 1750 2250 13 4 Additional Information on Blasting Productivity Air volume and pressure are very important The blasting production rate will increase with higher blasting pressur...

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