Leser 810 Series User manual

Assembly of the

Main Valve

Series 810 and 820

Assembly of the Main Valve | LESER GmbH & Co. KG | 05.06.2018 | Rev. 00

Assembly of the

Main Valve

Objectives 
Disassembly of the pilot 
supply filter
Disassembly of the manual 
blowdown
Disassembly of the remote 
sensing
Disassembly of the piston 
and disc
Disassembly of the piston
Disassembly of the luproseal 
OC R20
Disassembly the disc
Disassembly of the seat
Disassembly of the pitot tube
Assembly of the
pitot tube
Assembly of the nozzle
Assembly of the O-Ring 
disc / stainless steel disc
Assembly of the piston 
and back up ring
Assembly of the luproseal 
OC R20
Assembly of the piston 
and disc
Assembly of the piston 
and liner
Assembly of the piston 
with liner and body
Assembly of the top plate
2 / 19Assembly of the Main Valve | LESER GmbH & Co. KG | 05.06.2018 | Rev. 00
Objectives of the presentation
Increase special knowledge 
Aim of this presentation is to explain the assembly of the 
Main Valve.
Objectives

Objectives 
Disassembly of the pilot 
supply filter
Disassembly of the manual 
blowdown
Disassembly of the remote 
sensing
Disassembly of the piston 
and disc
Disassembly of the piston
Disassembly of the luproseal 
OC R20
Disassembly the disc
Disassembly of the seat
Disassembly of the pitot tube
Assembly of the
pitot tube
Assembly of the nozzle
Assembly of the O-Ring 
disc / stainless steel disc
Assembly of the piston 
and back up ring
Assembly of the luproseal 
OC R20
Assembly of the piston 
and disc
Assembly of the piston 
and liner
Assembly of the piston 
with liner and body
Assembly of the top plate
3 / 19Assembly of the Main Valve | LESER GmbH & Co. KG | 05.06.2018 | Rev. 00
Assembly of the 
pitot tube
Assembly Instructions
Assembly of the pitot tube
Span body [1] with outlet on test 
bench
Insert pitot tube [2] in body [1]
Complete with tube [3] (depends on
nominal size)
Cover O-ring [63] (O-ring is 9,
19x2,62) with soapy water and pull 
on fitting [4]
Make sure that O-rings are twist free
Screw fitting [4] in body [1]
While tightening fitting [4], align pitot
tube [2] in direction of inlet with pitot
tube assembly tool
Make sure that inlet of pitot tube is 
aligned within approx. ± 5°
1. Steps –Descriptions
1
2
34

Objectives 
Disassembly of the pilot 
supply filter
Disassembly of the manual 
blowdown
Disassembly of the remote 
sensing
Disassembly of the piston 
and disc
Disassembly of the piston
Disassembly of the luproseal 
OC R20
Disassembly the disc
Disassembly of the seat
Disassembly of the pitot tube
Assembly of the
pitot tube
Assembly of the nozzle
Assembly of the O-Ring 
disc / stainless steel disc
Assembly of the piston 
and back up ring
Assembly of the luproseal 
OC R20
Assembly of the piston 
and disc
Assembly of the piston 
and liner
Assembly of the piston 
with liner and body
Assembly of the top plate
4 / 19Assembly of the Main Valve | LESER GmbH & Co. KG | 05.06.2018 | Rev. 00
Assembly Instructions
Assembly of the pitot tube
2. Supplies
Soapy water
Molycote D paste
Lubricate components acc. to LID
3. Tools
Hook tool for O-rings
Helpful: Pitot tube-assembly tool
Open-end wrench acc. to LID
Torque wrench (Tightening torques 
acc. to LID)
4. Appliance
Test bench
5
6
6
Assembly of the 
pitot tube

Objectives 
Disassembly of the pilot 
supply filter
Disassembly of the manual 
blowdown
Disassembly of the remote 
sensing
Disassembly of the piston 
and disc
Disassembly of the piston
Disassembly of the luproseal 
OC R20
Disassembly the disc
Disassembly of the seat
Disassembly of the pitot tube
Assembly of the
pitot tube
Assembly of the nozzle
Assembly of the O-Ring 
disc / stainless steel disc
Assembly of the piston 
and back up ring
Assembly of the luproseal 
OC R20
Assembly of the piston 
and disc
Assembly of the piston 
and liner
Assembly of the piston 
with liner and body
Assembly of the top plate
5 / 19Assembly of the Main Valve | LESER GmbH & Co. KG | 05.06.2018 | Rev. 00
Mount the POSV with inlet
Pull O-ring [61] and back up ring [62] on
nozzle [5] 
Cover O-ring with soapy water
Make sure that O-rings are twist free
Screw nozzle [5] into body [1] by 
hand
Install nozzle assembly tool in that 
order: protection cap; adapter; 
socket wrench; socket extension; 
guide; fix guide with three nuts 
Screw nozzle [5] in with torque wrench
Assembly of the nozzle
Assembly Instructions
Assembly of the nozzle
1. Steps –Descriptions
12
34

Objectives 
Disassembly of the pilot 
supply filter
Disassembly of the manual 
blowdown
Disassembly of the remote 
sensing
Disassembly of the piston 
and disc
Disassembly of the piston
Disassembly of the luproseal 
OC R20
Disassembly the disc
Disassembly of the seat
Disassembly of the pitot tube
Assembly of the
pitot tube
Assembly of the nozzle
Assembly of the O-Ring 
disc / stainless steel disc
Assembly of the piston 
and back up ring
Assembly of the luproseal 
OC R20
Assembly of the piston 
and disc
Assembly of the piston 
and liner
Assembly of the piston 
with liner and body
Assembly of the top plate
6 / 19Assembly of the Main Valve | LESER GmbH & Co. KG | 05.06.2018 | Rev. 00
Assembly Instructions
Assembly of the nozzle
2. Supplies
Molykote D Paste
Soapy water
Lubricate components acc. to LID
3. Tools
Nozzle-assembly tool acc nominal 
size
Depth caliper
Torque wrench with square drive ¾” 
(Tightening torques acc. to LID)
4. Appliance
Test bench
56
7
8
9
10
Assembly of the nozzle

Objectives 
Disassembly of the pilot 
supply filter
Disassembly of the manual 
blowdown
Disassembly of the remote 
sensing
Disassembly of the piston 
and disc
Disassembly of the piston
Disassembly of the luproseal 
OC R20
Disassembly the disc
Disassembly of the seat
Disassembly of the pitot tube
Assembly of the
pitot tube
Assembly of the nozzle
Assembly of the O-Ring 
disc / stainless steel disc
Assembly of the piston 
and back up ring
Assembly of the luproseal 
OC R20
Assembly of the piston 
and disc
Assembly of the piston 
and liner
Assembly of the piston 
with liner and body
Assembly of the top plate
7 / 19Assembly of the Main Valve | LESER GmbH & Co. KG | 05.06.2018 | Rev. 00
Check nozzle projection hs 
Assembly Instructions
Assembly of the nozzle
Nominal size, Orifice hs +2,5 / -0,5 [mm]
1x2“ D, E, F, G 85,3
1,5x2“ D, E, F, H 96,3
1,5x3“ G,H 106,8
1,5x3“ J 112,8
2x3“ G, H, J 115,8
2x3“ K+ 120,8
3x4“ J, K, L 134,3
3x4“ N+ 154,3
4x6“ L, M, N 167,3
4x6“ P 181,3
4x6“ P+ 190,3
6x8“ Q, R 258,8
6x8“ R+ 268,8
8x10“ T 324,3
8x10“ T+ 334,3
Assembly of the nozzle

Objectives 
Disassembly of the pilot 
supply filter
Disassembly of the manual 
blowdown
Disassembly of the remote 
sensing
Disassembly of the piston 
and disc
Disassembly of the piston
Disassembly of the luproseal 
OC R20
Disassembly the disc
Disassembly of the seat
Disassembly of the pitot tube
Assembly of the
pitot tube
Assembly of the nozzle
Assembly of the O-Ring 
disc / stainless steel disc
Assembly of the piston 
and back up ring
Assembly of the luproseal 
OC R20
Assembly of the piston 
and disc
Assembly of the piston 
and liner
Assembly of the piston 
with liner and body
Assembly of the top plate
8 / 19Assembly of the Main Valve | LESER GmbH & Co. KG | 05.06.2018 | Rev. 00
Cover O-ring [7.3] with soapy water
Place O-ring [7.3] into disc [7.1]
Make sure that O-ring is twist free
Place disc retainer [7.2] into disc [7.1]
Screw on nut [7.4] 
Secure nut by two prick punches
Assembly of the O-Ring 
disc / stainless steel
1. Steps –Descriptions
Assembly Instructions
Assembly of the O-Ring disc / stainless steel disc 
1

Objectives 
Disassembly of the pilot 
supply filter
Disassembly of the manual 
blowdown
Disassembly of the remote 
sensing
Disassembly of the piston 
and disc
Disassembly of the piston
Disassembly of the luproseal 
OC R20
Disassembly the disc
Disassembly of the seat
Disassembly of the pitot tube
Assembly of the
pitot tube
Assembly of the nozzle
Assembly of the O-Ring 
disc / stainless steel disc
Assembly of the piston 
and back up ring
Assembly of the luproseal 
OC R20
Assembly of the piston 
and disc
Assembly of the piston 
and liner
Assembly of the piston 
with liner and body
Assembly of the top plate
9 / 19Assembly of the Main Valve | LESER GmbH & Co. KG | 05.06.2018 | Rev. 00
2. Supplies
Soapy water
Lubricate components acc. to LID
3. Tools
Ring wrench acc. to LID
Torque wrench (Tightening torques 
acc. to LID)
4. Appliance
None
Assembly Instructions
Assembly of the O-Ring disc / stainless steel disc 
2
3
Assembly of the O-Ring 
disc / stainless steel

Objectives 
Disassembly of the pilot 
supply filter
Disassembly of the manual 
blowdown
Disassembly of the remote 
sensing
Disassembly of the piston 
and disc
Disassembly of the piston
Disassembly of the luproseal 
OC R20
Disassembly the disc
Disassembly of the seat
Disassembly of the pitot tube
Assembly of the
pitot tube
Assembly of the nozzle
Assembly of the O-Ring 
disc / stainless steel disc
Assembly of the piston 
and back up ring
Assembly of the luproseal 
OC R20
Assembly of the piston 
and disc
Assembly of the piston 
and liner
Assembly of the piston 
with liner and body
Assembly of the top plate
10 / 19Assembly of the Main Valve | LESER GmbH & Co. KG | 05.06.2018 | Rev. 00
Put piston top [6.2] and piston body [6.1] with 
O-ring [6.3] and back up ring [6.4] together
Lubricate O-ring and guide rings [6.5] with 
Halocarbon 56 S acc. to LID
Screw piston top [6.2] and piston body [6.1] 
together with allen head screws [6.6]
Assembly of the piston 
and back up ring 
1. Steps –Descriptions
Assembly Instructions
Assembly of the piston and back up ring 
2. Supplies
Halocarbon 56 S
Lubricate components acc. to LID
3. Tools
Torque wrench with allen key acc. to LID
Torque wrench (Tightening torques acc. to 
LID
4. Appliance
Parallel vice with aluminium jaws
1
2
3