Continuing our focus on quality products!

BSI & Williams Air Valves

Air Valves

A new addition to BSI, we now manufacture a wide range of Air Valve Products. Producing 90 air valve and air treadle assemblies allows us to provide over 900 piece parts and repair kits formerly available from Williams Controls. We also stock many other part numbers as conversions of existing factory products, you can download our current catalog but always feel free to contact us about availability.

Model Number Part Number Description
WM43B1 111135 AIR REGULATOR
WM80 111231 DOUBLE CHECK AIR VALVE
WM80A 111232 DOUBLE CHECK AIR VALVE
WM87A 111258 PRESSURE HOLDBACK
WM87C 111263 PRESSURE HOLDBACK
WM90A 111276 MODULATING CONTROL VALVE, AIR REGULATOR
WM90AW N/A MODULATING CONTROL VALVE, AIR REGULATOR
WM90B 111285 MODULATING CONTROL VALVE, AIR REGULATOR
WM90BM 111292 MODULATING CONTROL VALVE, AIR REGULATOR
WM90D 111300 MODULATING CONTROL VALVE, AIR REGULATOR
WM90DA 111301 MODULATING CONTROL VALVE, AIR REGULATOR
WM90DB 111302 MODULATING CONTROL VALVE, AIR REGULATOR
WM90DM 111303 MODULATING CONTROL VALVE, AIR REGULATOR
WM90DT 111304 MODULATING CONTROL VALVE, AIR REGULATOR
WM90DX 116697 FAIL-SAFE PNEUMATIC REG. VALVE
WM101CA 100352 EMERGENCY RELAY VALVE
WM101P 100361 EMERGENCY RELAY VALVE
WM106A N/A MODULATING DASH VALVE
WM147BC 111526 RELAY VALVE NORMALLY CLOSED 3 WAY
WM147C 111527 RELAY VALVE NORMALLY CLOSED 3 WAY
WM147E 111530 RELAY VALVE NORMALLY CLOSED 2 WAY
WM147F 111531 RELAY VALVE NORMALLY OPEN 3 WAY
WM147HC 111535 RELAY VALVE NORMALLY OPEN
WM147L1 130845 RELAY VALVE NORMALLY CLOSED 3 WAY
WM147P 111542 RELAY VALVE NORMALLY OPEN 3 WAY
WM148A 111549 PUSH BUTTON VALVE 3 WAY
WM148W 111531 PUSH BUTTON VALVE 3 WAY
WM219C1 111814 TOGGLE VALVE 3 WAY 2 POSITION
WM219C3 111816 TOGGLE VALVE 3 WAY 2 POSITION
WM219C4 111817 TOGGLE VALVE 3 WAY 2 POSITION
WM224H 111841 COMPENSATING HAND VALVE
WM227F 100512 AIR BRAKE RELAY VALVE
WM271A 111913 HOSTLER VALVE
WM279E1 111940 SELF RELIEVING REGULATOR w / BRACKET
WM279R 111949 SELF RELIEVING PRESSURE REGULATOR
WM279R2 117599 SELF RELIEVING PRESSURE REGULATOR
WM279R3 111951 SELF RELIEVING PRESSURE REGULATOR
WM292B 111999 HIGH VOLUME COMPENSATING RELAY VALVE
WM305D1 118266 SINGLE TREADLE / DUAL VALVE
WM305-102 N/A SINGLE TREADLE / DUAL VALVE
WM314B 112173 QUICK RELEASE VALVE
WM318A 112201 TRACTOR PROTECTION VALVE w / ADJUSTABLE RATIO
WM320A 112211 TRACTOR PROTECTION VALVE
WM321 112215 EMERGENCY SAFETY VALVE
WM325 112229 PARKING BRAKE CONTROL VALVE
WM331C2 110227 FLOOR VALVE
WM333S 112299 CONTROL VALVE
WM338P 112371 RELAY VALVE NORMALLY OPEN
WM338T100 112381 RELAY VALVE NORMALLY OPEN
WM338T101 131523 RELAY VALVE NORMALLY OPEN
WM342A 112405 ADJUSTABLE SAFETY VALVE 3/8
WM342B 112407 ADJUSTABLE SAFETY VALVE 1/4
WM352A 112468 MODULATING VALVE HIGH FLOW
WM352F 117983 MODULATING VALVE HIGH FLOW
WM353E 112479 INDUSTRIAL TREADLE VALVE
WM366A 112534 QUICK RELEASE VALVE
WM366B 112536 QUICK RELEASE VALVE
WM371A 112550 PUSH BUTTON LEVER
WM388-106 118090 PNEUMATIC THROTTLE CONTROL CYLINDER
WM388U1A1A 117402 THROTTLE SLAVE
WM388U1C2B 117886 PNEUMATIC THROTTLE CONTROL CYLINDER
WM388U1C1D 117888 PNEUMATIC THROTTLE CONTROL CYLINDER
WM388U1C3D 119667 THROTTLE / FAST IDLE
WM397J 100708 3 WAY HOLDING VALVE / SEAT CONTROL
WM399L 112799 DUAL TREADLE BRAKE /THROTTLE VALVE
WM412A 112841 SHUTTLE VALVE
WM413A1 130877 DOUBLE SHUTTLE VALVE
WM445 SERIES SHIFTER, SHIFT CONTROL, SEQUENCE PROGRAMMER
WM453A 113072 PNEUMATIC THROTTLE PEDAL
WM453B 113073 PNEUMATIC THROTTLE PEDAL
WM453C 113074 PNEUMATIC THROTTLE PEDAL
WM453M 116731 PNEUMATIC THROTTLE PEDAL
WM453M2 117903 PNEUMATIC THROTTLE PEDAL
WM453M102 119684 PNEUMATIC THROTTLE PEDAL
WM453M110 118962 PNEUMATIC THROTTLE PEDAL
WM453N 117270 PNEUMATIC THROTTLE PEDAL
WM453-110 118872 PNEUMATIC THROTTLE PEDAL
WM458B 113117 SHIFT SELECTOR VALVE
WM459L 113129 REGULATOR PANEL
WM472A 113218 TREADLE VALVE
WM472C 113220 TREADLE VALVE
WM472D 113222 TREADLE VALVE
WM472E 113224 TREADLE VALVE
WM476B 113259 PNEUMATIC THROTTLE PEDAL
WM476C 113260 PNEUMATIC THROTTLE PEDAL
WM476F5A1 117209 PNEUMATIC THROTTLE PEDAL
WM476F5A2 130634 PNEUMATIC THROTTLE PEDAL
WM498B 104474 TOGGLE VALVE
WM498C 104475 PUSH BUTTON VALVE
WM498P 106849 ROCKER VALVE
WM498W 117683 TOGGLE VALVE
WM498-108 N/A MULTI-VALVE MANIFOLD PANEL ASSY
WM498-603 113413 MULTI-VALVE MANIFOLD PANEL ASSY
WM499C 113470 AIR STARTER RELAY
WM511C 119130 HYDRAULIC PROPORTIONAL PEDAL
WM512C 119436 HYDRAULIC THROTTLE SLAVE
WM515C 119129 HYDRAULIC THROTTLE CYLINDER
WM517A 119493 LIFT AXLE CONTROL PANEL
WM521A1 130300 AIR CONTROL VALVE
WM521B1 130424 AIR CONTROL VALVE SET OF 2
WM521C1 130425 AIR CONTROL VALVE SET OF 3
WM521RA4 130940 AIR CONTROL VALVE REGULATOR
WM522A1 130386 JOYSTICK CONTROLLER
WM522D1 131860 JOYSTICK CONTROLLER w/ELECTRIC SWITCH IN LEVER
WM606C1 113724 COLUMN MOUNTED AIR REGULATOR
WM606C1C 113726 COLUMN MOUNTED AIR REGULATOR
WM606C2 113727 COLUMN MOUNTED AIR REGULATOR
WM606C2C 113730 COLUMN MOUNTED AIR REGULATOR
WM607A1 113744 PANEL MOUNTED AIR REGULATOR VALVE
WM607B1 113754 PANEL MOUNTED AIR REGULATOR VALVE
WM607C1 113762 PANEL MOUNTED AIR REGULATOR VALVE
WM607C1X2 100407 PANEL MOUNTED AIR REGULATOR VALVE
WM607D1 N/A PANEL MOUNTED AIR REGULATOR VALVE
WM607E3X2 N/A PANEL MOUNTED AIR REGULATOR VALVE
WM607B3 113760 PANEL MOUNTED AIR REGULATOR VALVE
WM607C3 113768 PANEL MOUNTED AIR REGULATOR VALVE
WM617A 113844 RELAY VALVE NORMALLY CLOSED
WM630-101 118393 RELAY NORMALLY CLOSED AIR/VACUUM
WM639A 113934 SHUTTLE VALVE
WM640A 113935 PNEUMATIC TREADLE HORIZONTAL
WM642F1 117894 PNEUMATIC THROTTLE CONTROL CYLINDER
WM642F3 119142 PNEUMATIC THROTTLE CONTROL CYLINDER
WM642F5 119151 PNEUMATIC THROTTLE CONTROL CYLINDER
WM653C 113978 AIR SCALE BLEEDR VALVE STD. LIFT
WM653D 113979 AIR SCALE BLEEDER VALVE HIGH LIFT
WM663A 113999 ENGINE SHUTDOWN, CUMMINS
WM672A 106850 DASH VALVE 3 WAY NON-OVERRIDE
WM674A 106841 DUAL FUNCTION PARKING BRAKE CONTROL
WM774A 117005 CHECK VALVE
WM775B 117830 PNEUMATIC TRANSMISSION MODULATOR
WM778A 118181 PRESSURE HOLDBACK
WM781 135253 CONTROL VALVE 3 WAY 2 POSITION
WM781A 118315 CONTROL VALVE 3 WAY 2 POSITION
WM782A 118316 CONTROL VALVE 4 WAY 2 POSITION
WM782B 119068 CONTROL VALVE 4 WAY 2 POSITION
WM783A 118317 CONTROL VALVE 3 POSITION 4 WAY
WM784A 118318 CONTROL VALVE 3 POS. 4 WAY SPRING RETURN
WM784B 118437 CONTROL VALVE 3 POS. 4 WAY SPRING RETURN
WM784B1 118713 CONTROL VALVE 3 POS. 4 WAY SPRING RETURN
WM786-100 118569 PANEL MOUNTED AIR REGULATOR VALVE
WM786A3 118338 PANEL MOUNTED AIR REGULATOR VALVE
WM786B1 118340 PANEL MOUNTED AIR REGULATOR VALVE
WM786B2 118341 PANEL MOUNTED AIR REGULATOR VALVE
WM786B3 118342 PANEL MOUNTED REGULATING VALVE
WM787F 130492 3 POS. 4 WAY REGULATOR CONTROLLER
WM770D 118139 EXHAUST BRAKE ASSY, GUILLOTINE, 4 - 5" DIA.
WM780A 118012 EXHAUST BRAKE ASSY, GULLOTINE, 3.5" OR LESS

BRAKE SYSTEMS INC. is carrying on the tradition of Williams Controls quality.  Recently purchased from Williams Controls, we own the dies, jigs and fixtures so we are able to control every step of the manufacturing and assembly. We have key engineers formerly with Williams now on staff to insure the continued quality of our products manufactured and assembled in Portland, Oregon USA. Air valves are 100% tested before leaving BSI. As a stocking manufacturer often we can ship same day. Non stock items have little lead time.

Made In The USAManufactured in Oregon!