TLV COSR-16 is an innovative steam pressure reducing valve designed to supply dry saturated steam at a constant pressure. Unlike the COS series which features a built-in separator and steam trap, the COSR series provides highly accurate pressure reduction utilizing a self-actuated pilot mechanism and a shock-absorbing piston.

Configuration

The COSR-16 series consists of a main valve section, a piston section, and a pilot section. Key components include the main body and cover, main valve and main valve seat, piston and piston rings, pilot valve, pilot valve seat, pilot screen, diaphragm, and adjustment coil spring.

Specifications

The COSR-16 supports a wide operating range, making it suitable for most standard steam pressure reduction applications.

Parameter	COSR-16
Primary Pressure Range	0.2 to 1.6 MPaG (2 to 16 barg)
Secondary Pressure Adjustable Range	Within 10 to 84% of primary pressure (min 0.55 MPaG)
Maximum Pressure Differential	0.85 MPa (8.5 bar)
Minimum Adjustable Flow Rate	5% of rated flow rate (10% for 65 mm and larger)

WARNING

To avoid malfunctions, product damage, accidents or serious injury, install properly and DO NOT use this product outside the specification range.

Piping and Installation

Proper installation ensures stable pressure and prevents chattering.

Recommended Straight Pipe Runs

• Inlet (primary side): Maintain a straight run of 10d or more when a manual valve or strainer is installed, and 30d or more for an automated on-off valve.
• Outlet (secondary side): Maintain a straight run of 15d or more for manual valves, and 30d or more for safety valves, control valves, or a secondary pressure reducing valve.

Valve Placements

• ON-OFF Valve: Install at the inlet side. Do not install a fast-acting solenoid valve at the outlet, as it may cause heavy chattering and damage.
• Control Valve: Install near the steam-using equipment. A safety valve should be installed downstream of the control valve.

Installation Angle

Install horizontally so the arrow matches steam flow, with the adjustment screw facing up. Allowable inclination is 10 degrees fore-aft and 15 degrees perpendicular to the flow.

External Sensing Line

North American models are factory prepared for external sensing. An external sensing line (10 mm / 3/8") MUST be installed with a slightly falling pitch. For other models, internal sensing is standard, but they can be modified for external sensing by removing the connecting tube and substituting a blind pin.

Adjustment

1. Blow down all pipe lines thoroughly.
2. Close the shutoff and bypass valves.
3. Remove the spanner cap, loosen the locknut, and turn the adjustment screw counterclockwise to release spring tension.
4. Slowly open the inlet shutoff valve.
5. Slightly open the outlet shutoff valve.
6. Turn the adjustment screw clockwise until the desired outlet pressure is obtained. Wait several minutes.
7. Fully open the outlet shutoff valve, tighten the locknut, and replace the cap.

Inspection and Maintenance

Annual disassembly and inspection are recommended to ensure long service life.

Part	Inspection and Maintenance Frequency
Pilot Screen	Disassemble and clean annually
Main Valve, Pilot Valve, Valve Seats	Replace after 15,000 hours
Piston Ring	Replace after 8,000 hours
Piston, Diaphragm	Replace after 30,000 hours