The TLV J3S-X-BV is a reliable and durable stainless steel free float steam trap that includes a built-in bypass valve to facilitate the discharge of large quantities of condensate produced at start-up by process equipment, heaters, air conditioners, and tank heating. The tight-sealing manually operated ball valve incorporated into the cover can be used for bypass blowdown to significantly reduce start-up times.

This revolutionary design employs a high-performance thermostatic capsule (X-element) as an air vent with a "fail open" feature that vents air automatically until close-to-steam temperature. The self-modulating precision-ground free float provides continuous, smooth, low-velocity condensate discharge as process loads vary, ensuring a steam-tight seal even under no-load conditions.

Operation

1. Initial Air and Cold Condensate Discharge At startup, before steam is supplied, the trap is cold so the X-element is contracted and the air vent valve seat is open. This allows for the rapid discharge of air through the air vent valve and cold condensate through the orifice. Initial air/condensate can be discharged rapidly using the bypass blowdown valve as necessary.

2. Condensate Discharge After the discharge of initial air and cold condensate (bypass blowdown valve closed), the heat of the inflowing steam and condensate causes the X-element to expand, closing the air vent valve. The rising condensate level causes the float to rise due to buoyancy, opening the orifice and allowing condensate to be discharged.

3. Hot Air Discharge Should hot air flow into the trap with the steam during normal operation, the temperature of the X-element drops, causing it to momentarily contract and open the air vent valve, which allows for the rapid discharge of the air. After the air is discharged and steam contacts the X-element, the temperature will increase causing the air vent valve to close.

4. Closed Position When the condensate flow rate decreases, the float falls as condensate is discharged, closing off the orifice. A water seal is maintained at all times over the orifice to prevent steam loss. The high steam temperature causes the X-element to expand, keeping the air vent closed.

Specifications

Model	J3S-X-BV
Connection	Screwed, Flanged
Size	1/2", 3/4", 1" (DN 15, 20, 25)
Orifice No.	2, 5, 10
Maximum Operating Pressure (PMO)	0.2, 0.5, 1.0 MPaG (2, 5, 10 barg)
Maximum Differential Pressure (ΔPMX)	0.2, 0.5, 1.0 MPa (2, 5, 10 bar)
Maximum Operating Temperature (TMO)	185 °C
Subcooling of X-element Fill	Up to 6 °C
Type of X-element	C6

PRESSURE SHELL DESIGN CONDITIONS

Maximum Allowable Pressure (PMA): 10 barg (1.0 MPaG) Maximum Allowable Temperature (TMA): 185 °C These are design conditions, NOT operating conditions. Do not use this product outside the recommended operating pressure, temperature, and other specification ranges.

Actuator Options

In addition to the manual J3S-X-BV, the series includes automated bypass models:

• J3S-X-MB (Motor Unit): Features a reversible motor (condenser run type single-phase induction motor) with ON-OFF control. Power consumption is 52 VA (100-110 V) or 62 VA (200-220 V). Open/close time is approximately 3.5 seconds (50 Hz). Rainproof water resistance.
• J3S-X-PB (Actuator Unit): Features a vane rotary pneumatic actuator. Air supply pressure is 0.3 - 1.0 MPaG (45 - 150 psig). Open/close time is 0.09 - 0.8 seconds. Rainproof water resistance.

Configuration and Materials

Description	Material	ASTM/AISI
Body	Cast Stainless Steel	A351/A351M Gr.CF8
Cover	Cast Stainless Steel	A351/A351M Gr.CF8
Float	Stainless Steel	AISI316L
Orifice Plug	Cast Stainless Steel	A351/A351M Gr.CF8
Screen inside/outside	Stainless Steel	AISI430/304
Cover Gasket	Fluorine Resin	PTFE
X-element	Stainless Steel	-
Air Vent Valve Seat	Stainless Steel	AISI420F
Ball	Stainless Steel	AISI304
Inlet/Outlet Valve Seat	Fluorine Resin w/ Graphite	PTFE
O-Ring	Fluorine Rubber	D2000HK
Gland Packing	Fluorine Resin w/ Carbon	PTFE

Dimensions

J3S-X-BV Screwed

Size	L (mm)	H (mm)	H1 (mm)	W (mm)	W1 (mm)	Weight (kg)
1/2"	120	183	105	89.5	90	3.0
3/4"	190	183	105	89.5	90	3.5
1"	200	183	105	89.5	90	3.7

J3S-X-BV Flanged

DN	L (DIN PN16)	L (ASME 150RF)	L (ASME 300RF)	H (mm)	H1 (mm)	W1 (mm)	Weight (kg)
15	170	175	175	183	105	90	4.0
20	170	195	195	183	105	90	4.4
25	180	215	219	183	105	90	5.7

Bypass Valve Usage

The built-in bypass valve cannot be used as a stop valve for the inlet and outlet of the product. It is recommended that a separate stop valve be installed at the inlet and outlet for maintenance purposes.

Capacities

Discharge Capacity (Steam Trap)

• Line numbers within the graph are orifice numbers.
• Differential pressure is the difference between the inlet and outlet pressure of the trap.
• Recommended safety factor: at least 1.5.

Bypass Capacity (Ball Valve)

• Capacities are based on continuous discharge of water at room temperature (Aperture: fully open) and are applicable for temperatures below 100°C.
• Capacities are the values for the bypass valve (ball valve). X-element values are not included.

Valve Operation

Operate the bypass valve (ball valve) in only the fully open or fully closed positions. Operation in an intermediate position will damage the valve seat and may lead to leaking of the valve.