DBV Metal to metal ball valves characteristics:

High Temperature Service 

General soft seated ball valves working temperature is limited up to 400°F, but metal-seated ball valves are guaranteed for a maximum service temperature of 800 °F.
Low Pressure Reliable Sealing 
DBV metal-seated ball valves adopt seat spring structure, which can push upstream seat tightly against the ball surface creating a reliable sealing even if extremely low pressure. 
Pressure Test 
Metal-seated ball valves maximum allowable seat leakage:  Air: ANSI/FCI 70-2 Class V
Absolute Fire Safe Guarantee 
YIHUAN metal-seated ball valves are absolute fire safe design. Metal-to-metal contact is designed between ball and seat, where is unconditional fire safe function. Flexible graphite gasket can prevent fluid leakage from between body & seat or body & adapter even if high temperature environments to reach fire-safe purpose. In addition, other sealing components such as stem packing can also reach fire-safe function and prevent external leakage, so all parts of the valve will not be damaged by high temperature service.
Blow-out Proof Stem& Anti-Static Device 
As general ball valves, YIHUAN metal-seated ball valves are provided with blow-out proof stem& anti-static device.

metal seated ball valves

Metal to metal seat ball valve material specifications

No.

Part

Material

1

Body

A216-WCB A352-LCB A351-CF8, CF8M, CF3, CF3M, Duplex

2

Seat

ASTM A182-F6+STL, 304+STL, F316+STL, F316L+STL

3

Antistatic Spring

Stainless Steel S.S.316

4

Thrust Washer

PTFE PPL

5

Screw

ASTM A193-B7, B8

6

Limited Plate

1015+Cr. Carbon Steel+Cr.

7

Lever

A216-WCB

8

Gland Flange

A216-WCB A351-CF8

9

Packing

PTFE Graphite

10

Stem

ASTM A182-F6, F304, F316, F316L, F304L,17-4PH, F51

11

Gasket

Stainless Steel+Graphite S.S.316+Graphite

12

Ball

ASTM A182-G6+N, F304+N, F316+N, F51+N

13

Seat Gasket

ASTM A182-F6, F304, F316, F316L

14

Bonnet

A216-WCB A352-LCB A351-CF8, CF8M, CF3, CF3M, Duplex

15

Seat Spring

Inconel X-7505 S.S.304 S.S.316

16

Seat Sealing

Graphite

17

Stud

ASTM A193-B7, B7M, B8, B8M

18

Nut

ASTM A194-2H, 2HM, 8, 8M