Jamesbury Valv‑Powr ™ Installation, maintenance, and operation of VPVL mod D actuator

Jamesbury Valv‑Powr ™  Installation, maintenance, and operation of VPVL mod D actuator

Basic technical parameters

Working medium: air, nitrogen; The air quality follows ISO 8573-1, with a maximum particle size of 30 μ m and a dew point of -20 ℃.

Maximum gas supply pressure: 8 bar (116 psi)

temperature range

Standard: -40 ℃~+80 ℃

High temperature HT: -15 ℃~+150 ℃

Low temperature LX: -51 ℃~+80 ℃

Lubrication: Pre lubrication at the factory, no additional lubrication required for the entire life under normal operating conditions.

Rotating external adjustable stroke: Close position 0 °± 5 °; Open position 90 °± 5 °, suitable for both indoor and outdoor use.

Airway action logic

Double acting (DA)

Inlet at port 2, exhaust at port 4 → piston separation, counterclockwise rotation (valve opening)

Inlet at port 4 and exhaust at port 2 → the piston is retracted towards the center and rotated clockwise (valve closed)

Spring to Close (SR) due to spring reset fault

Inlet 2, compression spring, counterclockwise valve opening; Reset the lost air spring and close the valve clockwise.

Reverse the assembly direction of the piston to switch to the fault open FO mode.

Installation steps

Confirm whether the fault mode meets the process requirements; To switch between faulty on/off for spring reset, the flip piston needs to be disassembled.

Install the ISO5211 flange of the actuator onto the valve according to the valve manual.

Connect the pressure regulating gas source and strictly prohibit exceeding the maximum of 8 bar.

Adjust the external limit screw according to the manual steps and set the fully open and fully closed positions.

The nameplate of the main body indicates the model, size, pressure, and serial number as the basis for ordering spare parts.

Maintenance, disassembly, and assembly

4.1 Maintenance cycle

Valmet recommends conducting inspections at least once every 5 years; Corrosion and frequent cycling conditions shorten the cycle. Factory pre lubrication, only perform appearance and limit checks on a daily basis; Replace damaged seals and bearings with a repair kit.

All fasteners are metric threads.

Repair kit list

Model standard repair kit, high-temperature repair kit

VPVL051‑800 RKP‑262 ~ RKP‑275 RKP‑233 ~ RKP‑246

4.2 Disassembly process (must release pressure, remove valve)

Remove the top position indicator component.

Remove the limit screws, nuts, washers, and O-rings on both sides.

Disassemble the end cap bolts:

VPVL051: The spring does not have an independent sleeve, and the bolt is slowly loosened evenly to gradually release the spring force;

VPVL100-800: After 4-5 turns of bolt loosening, the rear cover should be loose; If there is still elasticity, it indicates that the spring cylinder is damaged. Stop disassembling the whole machine and send it to the repair center.

Remove the spring cylinder assembly (do not disassemble the spring cylinder itself) and remove the end cap O-ring.

Fix the cylinder body, rotate the output shaft, and remove the pistons on both sides; Do not blow the piston out with air pressure. Check the wear of the piston rack teeth surface. Remove the piston bearing and piston O-ring.

Remove the output shaft retaining ring and thrust washer, take out the output small gear shaft, and remove the upper and lower bearings of the large and small gears and the shaft seal O-ring.

Cleaning of parts and checking for wear and tear; Replace damaged parts.

Recommended lubricating grease

Universal sports pair, gear rack: Molykote ®  G‑2003；

O-ring: Dow Corning Silicone 111;

LX Low Temperature Version: Parker Super-O-Lube.

4.3 Assembly Process

Assembly of output small gear shaft: Install upper and lower bearings, O-rings, and apply corresponding lubricating grease; Install the Octa Cam into the octagonal cam, and assemble the thrust bearing, washer, and retaining spring.

Piston assembly: Install bearings and O-rings on the piston; Apply lubricating grease to the inner hole of the cylinder body and the tooth surface of the gear rack; Fix the cylinder body, align the angle of the octagonal cam, and simultaneously install the pistons on both sides into the cylinder body; The distance "A" between the exposed pistons on both sides must be equal; Manually rotate the output shaft to verify a travel margin of ± 5 °.

Spring reset model: Install the spring cylinder according to the corresponding spring color according to the model; Assemble the O-ring of the end cap, install the end cap, and diagonally tighten the end cap bolts according to the specified torque.

The manual provides a comparison table of tightening torque (N · m, ft lbs) for each specification of end cap bolt.

External limit screw adjustment

Right screw: Control clockwise (close valve) endpoint; Left screw: controls the counterclockwise (valve opening) endpoint.

When the ventilation cycle actuator reaches the end point, screw in/out the adjustment screw in place, and keep the adjustment screw still while locking the locking nut.

Install a top position indicator to ensure that the indication matches the actual position of the valve.

100% full stroke adjustable limit AS option: a long limit screw inside the end cap, used to limit counterclockwise travel, divided into two operation steps: double action and spring reset.

Mechanical Safety Lock LD (OSHA Maintenance Lock)

Used to lock the actuator fully open (90 °) or fully closed (0 °) during maintenance.

Remove the original standard limit screw, replace with blocking screw (226)+adjustment screw (227), special nut, washer, and O-ring.

Rotate the actuator to the target locking position (0 ° or 90 °, deviation ≤± 2 °) and tighten the dedicated nut.

Assemble safety protection cover, install padlock, and keep the key properly.

After installation, conduct a functional test with full air pressure to confirm reliable locking.

Attention: For old equipment with serial number ≤ 10136023, the rotating octagonal cam needs to be disassembled before assembling the lock kit, otherwise the lock will fail.

Deceptichable Manual Override (DO)

Installed between the valve and actuator, the automatic mode gear is disengaged; Manual mode engagement gearbox handwheel operated valve.

Installation key points

Prioritize installing the handwheel into the gearbox and confirm that the flange and valve stem match.

The valve is fully closed, the gearbox is pre adjusted to fully closed, and it is recommended to add gaskets for sealing between the flanges.

Complete the installation of the gearbox, and then install the upper pneumatic actuator; Adjust the on/off limit screws of the gearbox separately.

operating procedure

Automatic mode: Pneumatic driven valve, gear disengagement.

Switch to manual mode

Completely release the actuator air source;

Pull out the knob, rotate the handle to switch to MAN manual mode, and place the knob back in position;

Rotate the handwheel to operate the valve; At least 8 turns from fully closed to fully open (depending on the model).

Switch back to automatic mode: Pull out the knob to switch back to AUTO automatic mode and restore gas supply.

Be sure to release pressure before switching modes to prevent damage to the mechanism.

Storage and spare parts ordering

Storage conditions: Dry environment, keep the original packaging box, do not remove the plastic plug of the air vent.

Repair suggestion: prioritize sending the entire machine to Valmet service center, do not disassemble the spring components by yourself; Clean the equipment before returning to the factory for maintenance and do not disassemble it.

Information must be provided for spare parts ordering: ① Complete model number on the body label; ② Serial number; ③ Part drawing number, part name, and quantity.

Attached is a complete explosion view BOM material list, with * indicating that the repair kit includes vulnerable parts (O-rings, various bearings).

Order code

Completely consistent with the coding rules of technical samples, for example: VPVL400 SR4/5 B AS D

Product series VPVL; 2. Specification size; 3. Form of action DA/SR4/5/SR6; 4. Shell protection B; 5. Function options (FO/HT/LX/AS/LD can be combined in multiple ways); 6. Model D; 7. Modification code.