Name: TANGGONG Industrial Globe Valve Series
Brand: TANGGONG VALVE GROUP
Availability: InStock

Question 1

What is the main difference between a globe valve and a gate valve?

Accepted Answer

A globe valve uses a disc and seat arrangement with an S-shaped flow path suitable for both shut-off and throttling, providing precise flow regulation. It has higher pressure drop due to the tortuous flow path. A gate valve is a linear-motion valve for on/off isolation only, with a straight-through bore offering minimal pressure drop but cannot throttle effectively. Globe valves are the preferred choice when flow regulation is required; gate valves are preferred for full-open full-close isolation with minimal head loss.

Question 2

What are globe valves used for?

Accepted Answer

Globe valves are used wherever flow regulation, frequent operation, or positive shut-off is needed. Common applications include: steam system flow control, boiler feedwater regulation, cooling water bypass lines, fuel oil flow control, chemical dosing systems, high-pressure vent and drain services, bypass lines around larger isolation valves, and sampling points in process plants. Their primary advantage is excellent throttling capability with a linear relationship between stem travel and flow.

Question 3

What is a bellows seal globe valve?

Accepted Answer

A bellows seal globe valve uses a metallic bellows element welded to both the valve stem and bonnet, creating a hermetic seal that prevents any stem leakage to the atmosphere. This design is essential for hazardous media (toxic, flammable), high-vacuum systems, heat transfer oils, and applications requiring fugitive emission compliance per ISO 15848. TANGGONG bellows seal globe valves undergo helium mass spectrometer leak testing to guarantee zero external leakage over extended service life.

Question 4

Why choose Y-pattern globe valve over straight pattern?

Accepted Answer

Y-pattern globe valves position the seat at approximately 45° to the flow axis, which reduces turbulence and pressure drop by about 30-50% compared to straight pattern (T-pattern) globe valves. This design is preferred for high-pressure steam, oil, and gas services where minimizing energy loss is critical. Y-pattern valves also handle higher velocities better and can be used in Class 150-2500 pressure ratings. They are commonly selected for steam turbine bypass, main steam isolation, and high-pressure process regulation.

Question 5

What materials are TANGGONG globe valves made from?

Accepted Answer

TANGGONG globe valves are available in cast carbon steel (ASTM A216 WCB) for general industrial service; chrome-molybdenum alloy steel (ASTM A217 WC6, WC9) for high-temperature steam and refinery applications; cast austenitic stainless steel (ASTM A351 CF8/SS304, CF8M/SS316) for corrosive and cryogenic service; forged carbon steel (ASTM A105) and forged stainless steel (ASTM A182 F304, F316) for high-pressure small-bore applications. Trim materials include 13Cr, SS304, SS316, Stellite hard-faced disc and seat for severe erosion-resistant service. Bellows seal options use multi-ply 316L or Inconel 625 bellows.

DN		150Lb Raised Face Flange (RF) Main Dimensions Dimensions (mm)
mm	in	L	D	D1	D2	b	n-φd	H	D0
15	1/2	108	89	60.5	35	11.2	4-16	241	100
20	3/4	117	98	69.9	43	12.7	4-16	241	100
25	1	127	108	79.2	51	14.2	4-16	242	125
32	11/4	140	117	89	63	16	4-16	280	160
40	11/2	165	127	98.6	73	17.5	4-16	286	160
50	2	203	152	120.7	92	19	4-19	368	200
65	21/2	216	178	139.7	105	22.4	4-19	387	200
80	3	241	190	152.4	127	24	4-19	411	250
100	4	292	229	190.5	157	24	4-19	454	250
125	5	356	254	216.0	186	24	8-22.5	455	350
150	6	406	279	241.3	216	25.4	8-22.5	541	350
200	8	495	343	298.5	270	28.4	8-22.5	651	450
250	10	622	406	362.0	324	30.2	12-25.4	800	450
300	12	698	483	431.8	381	32	12-25.4	1231	600
350	14	787	533	476.3	413	35	12-29	1450	600
400	16	914	597	539.8	470	36.6	26-29	1645	600

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