TLV PN-COS-16 is a remotely controllable pneumatically actuated control valve for steam. It utilizes the structure of the COSPECT series pilot operated pressure reducing valve. Steam-using equipment can achieve its intended efficiency only if the steam being used is very dry. The PN-COS-16 features a built-in cyclone separator, screen, and steam trap that eliminates entrained condensate and scale, making possible the supply of very dry steam at a stable pressure.

The PN-COS-16 can operate automatically and provide accurate pressure control and temperature control when combined with a digital indicator controller or a general-purpose controller. Additionally, manual remote setting or 2-point pressure switching is possible by combination with an air regulator.

Features

1. The rapid response pneumatic actuator precisely adjusts the valve position to ensure accurate pressure control.
2. Built-in cyclone separator, with condensate separation efficiency as high as 98%, and self-modulating free float steam trap provide dry, high-quality steam supply.
3. Large surface area integral screens for pilot valve and main valve extend trouble-free service.
4. Combining with a controller and an electropneumatic transducer enables automatic PID operation.
5. When combined with an air regulator it can be used as a pressure reducing valve to set secondary pressure remotely, and 2 point pressure switching is possible as well.
6. By adjusting the internal spring load, steam can continue to be supplied at the required lowest set pressure even with motive air cut off (emergency case).

Specifications

Specification	Value
Body Material	Cast Iron (FC250/GG-25), Ductile Cast Iron (GGG40.3), Cast Stainless Steel (A351 Gr.CF8/CF8M)
Connection	Flanged (ASME, DIN)
Size	DN 15, 20, 25, 40, 50
Max. Operating Pressure (PMO)	16 barg (1.6 MPaG)
Max. Operating Temperature (TMO)	220 °C
Primary Pressure Range	2 - 16 barg (0.2 - 1.6 MPaG)
Adjustable Pressure Range	Within 10 - 84% of primary pressure (Minimum 0.3 barg)
Minimum Adjustable Flow Rate	5% of rated flow rate
Motive Medium	Oil-free air, filtered to 5 μm
Required Motive Air Pressure	[Desired secondary pressure + 1] barg or higher

WARNING

DO NOT use the product in excess of the maximum operating pressure differential; such use could make discharge through the steam trap impossible (blocked).

Cv & Kvs Values

Nominal Valve Size (DN)	15	20	25	40	50
Kvs (DIN)	3.3	5.9	9.5	20.6	31.9
Cv (UK)	3.2	5.7	9.2	20.0	31.0
Cv (US)	3.8	6.9	11.1	24.0	37.2

Configuration

No.	Description	Material
1	Main Body	Cast Iron / Ductile Cast Iron / Cast Stainless Steel
2	Trap Body	Same material as Main Body
3	Trap Cover	Same material as Main Body
4	Separator	Cast Stainless Steel
5	Float	Stainless Steel
6	Float Cover	Cast Iron / Cast Stainless Steel
7	Trap Valve Seat	Stainless Steel
8	Separator Screen	Stainless Steel
9	Main Valve Seat	Stainless Steel
10	Main Valve	Stainless Steel
12	Piston	Cast Stainless Steel
13	Cylinder	Stainless Steel
14	Pilot Screen	Stainless Steel
16	Pilot Body	Same material as Main Body
18	Pilot Valve	Stainless Steel
20	Diaphragm	Stainless Steel
23	Coil Spring	Carbon Steel
24	Adjustment Screw	Carbon Steel

Dimensions

DN	L (DIN PN25/40)	L (ASME 150RF)	L (ASME 300RF)	H	H1	W	Weight (kg)
15	150	170	170	537	327	105	17
20	150	182	182	537	327	105	18
25	160	188	192	564	324	150	23
40	200	220	224	614	344	165	29
50	230	255	261	677	357	195	44

(Weight is for PN 25/40)

Trap Discharge Capacity

1. The discharge capacity is the maximum continuous condensate discharge 6 °C below saturated steam temperature.
2. The differential pressure is the difference between the PN-COS inlet and its trap outlet pressure.

Correct Usage and Installation

Installing an ON/OFF Valve

If an on-off valve, such as a motorized valve, is required to stop supply of steam to the steam-using equipment, install it at the inlet side of the PN-COS-16. If a solenoid valve is installed at the outlet, its opening and closing will cause heavy chattering and may lead to damage of the piston and main valve.

Installing a Control Valve

A control valve installed between the PN-COS-16 and the steam-using equipment for controlling equipment temperature may raise the pressure between the PN-COS-16 and the control valve when the control valve is closed. A safety valve should be installed downstream of the control valve.

Maintenance

To ensure long service life of the PN-COS-16, the following inspection and maintenance should be performed regularly.

Part	Inspection and Maintenance Frequency
Screens (Separator, Pilot)	Disassemble and clean annually.
Main Valve, Pilot Valve	Replace after approximately 15,000 hours.
Piston Ring	Replace after approximately 8,000 hours.
Piston	Replace after approximately 30,000 hours.
Trap Valve Seat	Replace after approximately 40,000 hours.
Diaphragm	Replace after approximately 30,000 hours.

Exploded View

DANGER

NEVER apply direct heat to the float. The float may explode due to increased internal pressure, causing accidents leading to serious injury or damage to property and equipment.